diff --git a/src/containers/blocks.jsx b/src/containers/blocks.jsx
index 00c395726ac75cf0331f636785808e172c736cf5..fbcc6616183b44b3a8250c85c8b486803248f28b 100644
--- a/src/containers/blocks.jsx
+++ b/src/containers/blocks.jsx
@@ -445,12 +445,12 @@ Blocks.defaultProps = {
 };
 
 const mapStateToProps = state => ({
-    anyModalVisible: Object.keys(state.modals).some(key => state.modals[key]),
-    extensionLibraryVisible: state.modals.extensionLibrary,
+    anyModalVisible: Object.keys(state.scratchGui.modals).some(key => state.scratchGui.modals[key]),
+    extensionLibraryVisible: state.scratchGui.modals.extensionLibrary,
     locale: state.intl.locale,
     messages: state.intl.messages,
-    toolboxXML: state.toolbox.toolboxXML,
-    customProceduresVisible: state.customProcedures.active
+    toolboxXML: state.scratchGui.toolbox.toolboxXML,
+    customProceduresVisible: state.scratchGui.customProcedures.active
 });
 
 const mapDispatchToProps = dispatch => ({
diff --git a/src/containers/cards.jsx b/src/containers/cards.jsx
index 3d08932f775894aa809014deb85b2cbaca78a93c..5dc081f7b96f883cdbe07cd05ec1d23ce6c2f76c 100644
--- a/src/containers/cards.jsx
+++ b/src/containers/cards.jsx
@@ -17,13 +17,13 @@ import {
 import CardsComponent from '../components/cards/cards.jsx';
 
 const mapStateToProps = state => ({
-    visible: state.cards.visible,
-    content: state.cards.content,
-    activeDeckId: state.cards.activeDeckId,
-    step: state.cards.step,
-    x: state.cards.x,
-    y: state.cards.y,
-    dragging: state.cards.dragging
+    visible: state.scratchGui.cards.visible,
+    content: state.scratchGui.cards.content,
+    activeDeckId: state.scratchGui.cards.activeDeckId,
+    step: state.scratchGui.cards.step,
+    x: state.scratchGui.cards.x,
+    y: state.scratchGui.cards.y,
+    dragging: state.scratchGui.cards.dragging
 });
 
 const mapDispatchToProps = dispatch => ({
diff --git a/src/containers/costume-tab.jsx b/src/containers/costume-tab.jsx
index 8f203e63352c6709ec0b171071a6a38417e74e3c..3ce034caa200b15cac7e7f7bc8042fdf9843d2f3 100644
--- a/src/containers/costume-tab.jsx
+++ b/src/containers/costume-tab.jsx
@@ -337,12 +337,12 @@ CostumeTab.propTypes = {
 };
 
 const mapStateToProps = state => ({
-    editingTarget: state.targets.editingTarget,
-    sprites: state.targets.sprites,
-    stage: state.targets.stage,
-    cameraModalVisible: state.modals.cameraCapture,
-    costumeLibraryVisible: state.modals.costumeLibrary,
-    backdropLibraryVisible: state.modals.backdropLibrary
+    editingTarget: state.scratchGui.targets.editingTarget,
+    sprites: state.scratchGui.targets.sprites,
+    stage: state.scratchGui.targets.stage,
+    cameraModalVisible: state.scratchGui.modals.cameraCapture,
+    costumeLibraryVisible: state.scratchGui.modals.costumeLibrary,
+    backdropLibraryVisible: state.scratchGui.modals.backdropLibrary
 });
 
 const mapDispatchToProps = dispatch => ({
diff --git a/src/containers/custom-procedures.jsx b/src/containers/custom-procedures.jsx
index 7605fd4b6501388c40a111667b4f80b5dada8d65..879800aae880313299ab53601e6a1f9f0f667d54 100644
--- a/src/containers/custom-procedures.jsx
+++ b/src/containers/custom-procedures.jsx
@@ -147,7 +147,7 @@ CustomProcedures.defaultProps = {
 };
 
 const mapStateToProps = state => ({
-    mutator: state.customProcedures.mutator
+    mutator: state.scratchGui.customProcedures.mutator
 });
 
 export default connect(
diff --git a/src/containers/gui.jsx b/src/containers/gui.jsx
index bc241be96ef93b9a865563a92fb64fd164a1d3a4..62c34de67e33d0fa4cb4e20886ef6fb866c98c8e 100644
--- a/src/containers/gui.jsx
+++ b/src/containers/gui.jsx
@@ -13,6 +13,7 @@ import {
     COSTUMES_TAB_INDEX,
     SOUNDS_TAB_INDEX
 } from '../reducers/editor-tab';
+import {setPlayer} from '../reducers/mode';
 
 import ProjectLoaderHOC from '../lib/project-loader-hoc.jsx';
 import vmListenerHOC from '../lib/vm-listener-hoc.jsx';
@@ -99,24 +100,26 @@ GUI.propTypes = {
 GUI.defaultProps = GUIComponent.defaultProps;
 
 const mapStateToProps = state => ({
-    activeTabIndex: state.editorTab.activeTabIndex,
-    blocksTabVisible: state.editorTab.activeTabIndex === BLOCKS_TAB_INDEX,
-    cardsVisible: state.cards.visible,
-    costumesTabVisible: state.editorTab.activeTabIndex === COSTUMES_TAB_INDEX,
-    importInfoVisible: state.modals.importInfo,
-    isPlayerOnly: state.mode.isPlayerOnly,
-    loadingStateVisible: state.modals.loadingProject,
-    previewInfoVisible: state.modals.previewInfo,
-    targetIsStage: state.targets.stage && state.targets.stage.id === state.targets.editingTarget,
-    soundsTabVisible: state.editorTab.activeTabIndex === SOUNDS_TAB_INDEX,
-    tipsLibraryVisible: state.modals.tipsLibrary
+    activeTabIndex: state.scratchGui.editorTab.activeTabIndex,
+    blocksTabVisible: state.scratchGui.editorTab.activeTabIndex === BLOCKS_TAB_INDEX,
+    cardsVisible: state.scratchGui.cards.visible,
+    costumesTabVisible: state.scratchGui.editorTab.activeTabIndex === COSTUMES_TAB_INDEX,
+    importInfoVisible: state.scratchGui.modals.importInfo,
+    isPlayerOnly: state.scratchGui.mode.isPlayerOnly,
+    loadingStateVisible: state.scratchGui.modals.loadingProject,
+    previewInfoVisible: state.scratchGui.modals.previewInfo,
+    targetIsStage: state.scratchGui.targets.stage &&
+    state.scratchGui.targets.stage.id === state.scratchGui.targets.editingTarget,
+    soundsTabVisible: state.scratchGui.editorTab.activeTabIndex === SOUNDS_TAB_INDEX,
+    tipsLibraryVisible: state.scratchGui.modals.tipsLibrary
 });
 
 const mapDispatchToProps = dispatch => ({
     onExtensionButtonClick: () => dispatch(openExtensionLibrary()),
     onActivateTab: tab => dispatch(activateTab(tab)),
     onActivateCostumesTab: () => dispatch(activateTab(COSTUMES_TAB_INDEX)),
-    onActivateSoundsTab: () => dispatch(activateTab(SOUNDS_TAB_INDEX))
+    onActivateSoundsTab: () => dispatch(activateTab(SOUNDS_TAB_INDEX)),
+    onSetPlayerMode: player => dispatch(setPlayer(player))
 });
 
 const ConnectedGUI = connect(
diff --git a/src/containers/monitor-list.jsx b/src/containers/monitor-list.jsx
index b3dcd5b7c7cfb2943f27caab43a0ff80191037ce..1499b5feac1d6b860377f44850a04241f9a5182d 100644
--- a/src/containers/monitor-list.jsx
+++ b/src/containers/monitor-list.jsx
@@ -33,7 +33,7 @@ MonitorList.propTypes = {
     moveMonitorRect: PropTypes.func.isRequired
 };
 const mapStateToProps = state => ({
-    monitors: state.monitors
+    monitors: state.scratchGui.monitors
 });
 const mapDispatchToProps = dispatch => ({
     moveMonitorRect: (id, x, y) => dispatch(moveMonitorRect(id, x, y))
diff --git a/src/containers/monitor.jsx b/src/containers/monitor.jsx
index fd7a584adff0a78f9f74eaef217b22c4b2b235f0..b39358c08fef4a5e42d124f6bec606c9b861076c 100644
--- a/src/containers/monitor.jsx
+++ b/src/containers/monitor.jsx
@@ -152,7 +152,7 @@ Monitor.propTypes = {
     y: PropTypes.number
 };
 const mapStateToProps = state => ({
-    monitorLayout: state.monitorLayout
+    monitorLayout: state.scratchGui.monitorLayout
 });
 const mapDispatchToProps = dispatch => ({
     addMonitorRect: (id, rect, savePosition) =>
diff --git a/src/containers/paint-editor-wrapper.jsx b/src/containers/paint-editor-wrapper.jsx
index 495df1a931c7ff64fe82a60c0fd05c2635c27da3..9b606f3dae07f3746dd5b51b5c5cd6851c4a7be3 100644
--- a/src/containers/paint-editor-wrapper.jsx
+++ b/src/containers/paint-editor-wrapper.jsx
@@ -66,7 +66,7 @@ const mapStateToProps = (state, {selectedCostumeIndex}) => {
         editingTarget,
         sprites,
         stage
-    } = state.targets;
+    } = state.scratchGui.targets;
     const target = editingTarget && sprites[editingTarget] ? sprites[editingTarget] : stage;
     const costume = target && target.costumes[selectedCostumeIndex];
     return {
@@ -75,7 +75,7 @@ const mapStateToProps = (state, {selectedCostumeIndex}) => {
         rotationCenterY: costume && costume.rotationCenterY,
         imageFormat: costume && costume.dataFormat,
         imageId: editingTarget && `${editingTarget}${costume.skinId}`,
-        vm: state.vm
+        vm: state.scratchGui.vm
     };
 };
 
diff --git a/src/containers/project-loader.jsx b/src/containers/project-loader.jsx
index 782dab60df5b960255c12eba9abd440e38eea21c..80ef161ea291d8fbb87e77d203fb314e187d725b 100644
--- a/src/containers/project-loader.jsx
+++ b/src/containers/project-loader.jsx
@@ -100,7 +100,7 @@ ProjectLoader.propTypes = {
 };
 
 const mapStateToProps = state => ({
-    vm: state.vm
+    vm: state.scratchGui.vm
 });
 
 const mapDispatchToProps = dispatch => ({
diff --git a/src/containers/project-saver.jsx b/src/containers/project-saver.jsx
index 0c755c8538d612547108508f9bd688a39eaf8ec9..c594421eca357181919dd021310d9b1703118d12 100644
--- a/src/containers/project-saver.jsx
+++ b/src/containers/project-saver.jsx
@@ -69,7 +69,7 @@ ProjectSaver.propTypes = {
 };
 
 const mapStateToProps = state => ({
-    vm: state.vm
+    vm: state.scratchGui.vm
 });
 
 export default connect(
diff --git a/src/containers/record-modal.jsx b/src/containers/record-modal.jsx
index f6ac44526b739b3419e83772776fa4ac530c9d48..8a57c03d7be0ba06fa2c6e4aa4693e63a3f51bb3 100644
--- a/src/containers/record-modal.jsx
+++ b/src/containers/record-modal.jsx
@@ -139,7 +139,7 @@ RecordModal.propTypes = {
 };
 
 const mapStateToProps = state => ({
-    vm: state.vm
+    vm: state.scratchGui.vm
 });
 
 const mapDispatchToProps = dispatch => ({
diff --git a/src/containers/sound-editor.jsx b/src/containers/sound-editor.jsx
index de10ebc2cd066dc3729ea2afebeb1c116970389b..6bd793fceb3d487d555ba0ae45f669b7c40f08ce 100644
--- a/src/containers/sound-editor.jsx
+++ b/src/containers/sound-editor.jsx
@@ -211,17 +211,17 @@ SoundEditor.propTypes = {
 };
 
 const mapStateToProps = (state, {soundIndex}) => {
-    const sprite = state.vm.editingTarget.sprite;
+    const sprite = state.scratchGui.vm.editingTarget.sprite;
     // Make sure the sound index doesn't go out of range.
     const index = soundIndex < sprite.sounds.length ? soundIndex : sprite.sounds.length - 1;
-    const sound = state.vm.editingTarget.sprite.sounds[index];
-    const audioBuffer = state.vm.getSoundBuffer(index);
+    const sound = state.scratchGui.vm.editingTarget.sprite.sounds[index];
+    const audioBuffer = state.scratchGui.vm.getSoundBuffer(index);
     return {
         soundId: sound.soundId,
         sampleRate: audioBuffer.sampleRate,
         samples: audioBuffer.getChannelData(0),
         name: sound.name,
-        vm: state.vm
+        vm: state.scratchGui.vm
     };
 };
 
diff --git a/src/containers/sound-tab.jsx b/src/containers/sound-tab.jsx
index e39a2b6d15f99e642dde3d02bcccead248c32ebf..d532c5ee9bc0b3cb359dfae24a75dd03ff9eec38 100644
--- a/src/containers/sound-tab.jsx
+++ b/src/containers/sound-tab.jsx
@@ -241,11 +241,11 @@ SoundTab.propTypes = {
 };
 
 const mapStateToProps = state => ({
-    editingTarget: state.targets.editingTarget,
-    sprites: state.targets.sprites,
-    stage: state.targets.stage,
-    soundLibraryVisible: state.modals.soundLibrary,
-    soundRecorderVisible: state.modals.soundRecorder
+    editingTarget: state.scratchGui.targets.editingTarget,
+    sprites: state.scratchGui.targets.sprites,
+    stage: state.scratchGui.targets.stage,
+    soundLibraryVisible: state.scratchGui.modals.soundLibrary,
+    soundRecorderVisible: state.scratchGui.modals.soundRecorder
 });
 
 const mapDispatchToProps = dispatch => ({
diff --git a/src/containers/sprite-selector-item.jsx b/src/containers/sprite-selector-item.jsx
index edb124b2c6086874d40cbc6734c0f892efb3c6a4..7d3fc2f21c45677102ef9feb3b4322c48b45dfe6 100644
--- a/src/containers/sprite-selector-item.jsx
+++ b/src/containers/sprite-selector-item.jsx
@@ -79,9 +79,9 @@ SpriteSelectorItem.propTypes = {
 };
 
 const mapStateToProps = (state, {assetId, costumeURL, id}) => ({
-    costumeURL: costumeURL || (assetId && state.vm.runtime.storage.get(assetId).encodeDataURI()),
-    receivedBlocks: state.hoveredTarget.receivedBlocks &&
-            state.hoveredTarget.sprite === id
+    costumeURL: costumeURL || (assetId && state.scratchGui.vm.runtime.storage.get(assetId).encodeDataURI()),
+    receivedBlocks: state.scratchGui.hoveredTarget.receivedBlocks &&
+            state.scratchGui.hoveredTarget.sprite === id
 });
 const mapDispatchToProps = dispatch => ({
     dispatchSetHoveredSprite: spriteId => {
diff --git a/src/containers/stage-header.jsx b/src/containers/stage-header.jsx
index 65677e29f224dcb2e9751a68c03012587e6d09f8..883c882fa120c343673febefbe5b14b814ced929 100644
--- a/src/containers/stage-header.jsx
+++ b/src/containers/stage-header.jsx
@@ -50,9 +50,9 @@ StageHeader.propTypes = {
 };
 
 const mapStateToProps = state => ({
-    stageSize: state.stageSize.stageSize,
-    isFullScreen: state.mode.isFullScreen,
-    isPlayerOnly: state.mode.isPlayerOnly
+    stageSize: state.scratchGui.stageSize.stageSize,
+    isFullScreen: state.scratchGui.mode.isFullScreen,
+    isPlayerOnly: state.scratchGui.mode.isPlayerOnly
 });
 
 const mapDispatchToProps = dispatch => ({
diff --git a/src/containers/stage-selector.jsx b/src/containers/stage-selector.jsx
index f3497a54cd9f2e187ffc5a5586b20f7492027f0c..a2039796f5e6379cc3bbb4be44447bdfc3890efe 100644
--- a/src/containers/stage-selector.jsx
+++ b/src/containers/stage-selector.jsx
@@ -99,8 +99,8 @@ StageSelector.propTypes = {
 };
 
 const mapStateToProps = (state, {assetId}) => ({
-    url: assetId && state.vm.runtime.storage.get(assetId).encodeDataURI(),
-    vm: state.vm
+    url: assetId && state.scratchGui.vm.runtime.storage.get(assetId).encodeDataURI(),
+    vm: state.scratchGui.vm
 });
 
 const mapDispatchToProps = dispatch => ({
diff --git a/src/containers/stage.jsx b/src/containers/stage.jsx
index b66efa2c5090ec70fb54f0c1a73340ea41a7aa66..881c9c929aa3cef447a1f9b8831670158b321969 100644
--- a/src/containers/stage.jsx
+++ b/src/containers/stage.jsx
@@ -395,10 +395,10 @@ Stage.defaultProps = {
 };
 
 const mapStateToProps = state => ({
-    isColorPicking: state.colorPicker.active,
-    isFullScreen: state.mode.isFullScreen,
+    isColorPicking: state.scratchGui.colorPicker.active,
+    isFullScreen: state.scratchGui.mode.isFullScreen,
     // Do not use editor drag style in fullscreen or player mode.
-    useEditorDragStyle: !(state.mode.isFullScreen || state.mode.isPlayerOnly)
+    useEditorDragStyle: !(state.scratchGui.mode.isFullScreen || state.scratchGui.mode.isPlayerOnly)
 });
 
 const mapDispatchToProps = dispatch => ({
diff --git a/src/containers/target-pane.jsx b/src/containers/target-pane.jsx
index 1178ed64ec9d7fc10eb6d07afe1fcba16a535ffb..dd20a4742f5825851410f3b8c5f901b815c5ace5 100644
--- a/src/containers/target-pane.jsx
+++ b/src/containers/target-pane.jsx
@@ -144,10 +144,10 @@ TargetPane.propTypes = {
 };
 
 const mapStateToProps = state => ({
-    editingTarget: state.targets.editingTarget,
-    hoveredTarget: state.hoveredTarget,
-    sprites: Object.keys(state.targets.sprites).reduce((sprites, k) => {
-        let {direction, size, x, y, ...sprite} = state.targets.sprites[k];
+    editingTarget: state.scratchGui.targets.editingTarget,
+    hoveredTarget: state.scratchGui.hoveredTarget,
+    sprites: Object.keys(state.scratchGui.targets.sprites).reduce((sprites, k) => {
+        let {direction, size, x, y, ...sprite} = state.scratchGui.targets.sprites[k];
         if (typeof direction !== 'undefined') direction = Math.round(direction);
         if (typeof x !== 'undefined') x = Math.round(x);
         if (typeof y !== 'undefined') y = Math.round(y);
@@ -155,9 +155,9 @@ const mapStateToProps = state => ({
         sprites[k] = {...sprite, direction, size, x, y};
         return sprites;
     }, {}),
-    stage: state.targets.stage,
-    raiseSprites: state.blockDrag,
-    spriteLibraryVisible: state.modals.spriteLibrary
+    stage: state.scratchGui.targets.stage,
+    raiseSprites: state.scratchGui.blockDrag,
+    spriteLibraryVisible: state.scratchGui.modals.spriteLibrary
 });
 const mapDispatchToProps = dispatch => ({
     onNewSpriteClick: e => {
diff --git a/src/containers/tips-library.jsx b/src/containers/tips-library.jsx
index 7d45f37a6c967aa2ff669464bc41042aee768da7..20304cab41b62caa541c718002995c54d4818afa 100644
--- a/src/containers/tips-library.jsx
+++ b/src/containers/tips-library.jsx
@@ -61,7 +61,7 @@ TipsLibrary.propTypes = {
 };
 
 const mapStateToProps = state => ({
-    visible: state.modals.tipsLibrary
+    visible: state.scratchGui.modals.tipsLibrary
 });
 
 const mapDispatchToProps = dispatch => ({
diff --git a/src/lib/app-state-hoc.jsx b/src/lib/app-state-hoc.jsx
index 7f7c2b0d626ca2f9d1bee0b377f6c0f0b3766e11..8093d238132689c9a601f32eb75b0dba28b9d20b 100644
--- a/src/lib/app-state-hoc.jsx
+++ b/src/lib/app-state-hoc.jsx
@@ -1,14 +1,18 @@
 import React from 'react';
 import PropTypes from 'prop-types';
 import {Provider} from 'react-redux';
-import {createStore, applyMiddleware, compose} from 'redux';
+import {createStore, applyMiddleware, combineReducers, compose} from 'redux';
 import throttle from 'redux-throttle';
 
 import {intlShape} from 'react-intl';
 import {IntlProvider, updateIntl} from 'react-intl-redux';
-import {intlInitialState} from '../reducers/intl.js';
-import {initialState as modeInitialState, setPlayer, setFullScreen} from '../reducers/mode.js';
-import reducer from '../reducers/gui';
+import intlReducer from '../reducers/intl.js';
+
+import guiReducer, {guiInitialState, initFullScreen, initPlayer} from '../reducers/gui';
+
+import {setPlayer, setFullScreen} from '../reducers/mode.js';
+
+import {ScratchPaintReducer} from 'scratch-paint';
 
 const composeEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose;
 const enhancer = composeEnhancers(
@@ -27,32 +31,22 @@ const AppStateHOC = function (WrappedComponent) {
     class AppStateWrapper extends React.Component {
         constructor (props) {
             super(props);
-            let intl = {};
-            let mode = {};
-            if (props.intl) {
-                intl = {
-                    defaultLocale: 'en',
-                    locale: props.intl.locale,
-                    messages: props.intl.messages
-                };
-            } else {
-                intl = intlInitialState.intl;
+            let initializedGui = guiInitialState;
+            if (props.isFullScreen) {
+                initializedGui = initFullScreen(initializedGui);
             }
-            if (props.isPlayerOnly || props.isFullScreen) {
-                mode = {
-                    isFullScreen: props.isFullScreen || false,
-                    isPlayerOnly: props.isPlayerOnly || false
-                };
-            } else {
-                mode = modeInitialState;
+            if (props.isPlayerOnly) {
+                initializedGui = initPlayer(initializedGui);
             }
+            const reducer = combineReducers({
+                intl: intlReducer,
+                scratchGui: guiReducer,
+                scratchPaint: ScratchPaintReducer
+            });
 
             this.store = createStore(
                 reducer,
-                {
-                    intl: intl,
-                    mode: mode
-                },
+                {scratchGui: initializedGui},
                 enhancer);
         }
         componentDidUpdate (prevProps) {
diff --git a/src/lib/vm-listener-hoc.jsx b/src/lib/vm-listener-hoc.jsx
index 37132632069669fd6f93765798e4ba171ff0068a..3fd9e2096f1f0c3de8b6b843ff75dba696d52af3 100644
--- a/src/lib/vm-listener-hoc.jsx
+++ b/src/lib/vm-listener-hoc.jsx
@@ -96,7 +96,7 @@ const vmListenerHOC = function (WrappedComponent) {
         attachKeyboardEvents: true
     };
     const mapStateToProps = state => ({
-        vm: state.vm
+        vm: state.scratchGui.vm
     });
     const mapDispatchToProps = dispatch => ({
         onTargetsUpdate: data => {
diff --git a/src/playground/blocks-only.jsx b/src/playground/blocks-only.jsx
index 636610433121756ecb2a84436a2abbe1b78f12f5..1a72e267b8776201ecf8cf9bda733142636087ce 100644
--- a/src/playground/blocks-only.jsx
+++ b/src/playground/blocks-only.jsx
@@ -10,7 +10,7 @@ import AppStateHOC from '../lib/app-state-hoc.jsx';
 
 import styles from './blocks-only.css';
 
-const mapStateToProps = state => ({vm: state.vm});
+const mapStateToProps = state => ({vm: state.scratchGui.vm});
 
 const VMBlocks = connect(mapStateToProps)(Blocks);
 const VMControls = connect(mapStateToProps)(Controls);
diff --git a/src/reducers/block-drag.js b/src/reducers/block-drag.js
index 5a261ceaa93459575a41046dc87b664c3af7c6b1..745cee756baee5a98fe053d67daa08a2ac4fb886 100644
--- a/src/reducers/block-drag.js
+++ b/src/reducers/block-drag.js
@@ -24,5 +24,6 @@ const updateBlockDrag = function (areBlocksOverGui) {
 
 export {
     reducer as default,
+    initialState as blockDragInitialState,
     updateBlockDrag
 };
diff --git a/src/reducers/cards.js b/src/reducers/cards.js
index 334225639ca579c80c3ab62ee6d267d10b81ef97..6f4add89d20b6936e55646f46771072d8d0904f9 100644
--- a/src/reducers/cards.js
+++ b/src/reducers/cards.js
@@ -107,6 +107,7 @@ const endDrag = function () {
 
 export {
     reducer as default,
+    initialState as cardsInitialState,
     activateDeck,
     viewCards,
     closeCards,
diff --git a/src/reducers/color-picker.js b/src/reducers/color-picker.js
index fc16354a0a25f0f92579c21382f5f0a87d51ac2a..b5edbdc475c5ad27b109583444f6dacbf9e56f49 100644
--- a/src/reducers/color-picker.js
+++ b/src/reducers/color-picker.js
@@ -34,6 +34,7 @@ const setCallback = callback => ({type: SET_CALLBACK, callback: callback});
 
 export {
     reducer as default,
+    initialState as colorPickerInitialState,
     activateColorPicker,
     deactivateColorPicker,
     setCallback
diff --git a/src/reducers/custom-procedures.js b/src/reducers/custom-procedures.js
index 2f4f63d983b0a610ce4395b0610db48e24ea21ab..3b982941e646710920d5ea44ddd8abec797940cb 100644
--- a/src/reducers/custom-procedures.js
+++ b/src/reducers/custom-procedures.js
@@ -60,6 +60,7 @@ const deactivateCustomProcedures = mutator => ({
 
 export {
     reducer as default,
+    initialState as customProceduresInitialState,
     activateCustomProcedures,
     deactivateCustomProcedures
 };
diff --git a/src/reducers/editor-tab.js b/src/reducers/editor-tab.js
index 21b3534e29fb2700a4a2469886445d4e2da0b557..e44a7ca842055c876a53367d6a9220adeaee0dcb 100644
--- a/src/reducers/editor-tab.js
+++ b/src/reducers/editor-tab.js
@@ -30,6 +30,7 @@ const activateTab = function (tab) {
 
 export {
     reducer as default,
+    initialState as editorTabInitialState,
     activateTab,
     BLOCKS_TAB_INDEX,
     COSTUMES_TAB_INDEX,
diff --git a/src/reducers/gui.js b/src/reducers/gui.js
index 8bb226a9074f6d4681830ce9deb0aa18b26a80a2..2368e2ec38b353a1cf863d38f34ce175935431dd 100644
--- a/src/reducers/gui.js
+++ b/src/reducers/gui.js
@@ -1,23 +1,60 @@
 import {combineReducers} from 'redux';
-import cardsReducer from './cards';
-import colorPickerReducer from './color-picker';
-import customProceduresReducer from './custom-procedures';
-import blockDragReducer from './block-drag';
-import editorTabReducer from './editor-tab';
-import hoveredTargetReducer from './hovered-target';
-import intlReducer from './intl';
-import menuReducer from './menus';
-import modalReducer from './modals';
-import modeReducer from './mode';
-import monitorReducer from './monitors';
-import monitorLayoutReducer from './monitor-layout';
-import targetReducer from './targets';
-import toolboxReducer from './toolbox';
-import vmReducer from './vm';
-import stageSizeReducer from './stage-size';
-import {ScratchPaintReducer} from 'scratch-paint';
+import cardsReducer, {cardsInitialState} from './cards';
+import colorPickerReducer, {colorPickerInitialState} from './color-picker';
+import customProceduresReducer, {customProceduresInitialState} from './custom-procedures';
+import blockDragReducer, {blockDragInitialState} from './block-drag';
+import editorTabReducer, {editorTabInitialState} from './editor-tab';
+import hoveredTargetReducer, {hoveredTargetInitialState} from './hovered-target';
+import menuReducer, {menuInitialState} from './menus';
+import modalReducer, {modalsInitialState} from './modals';
+import modeReducer, {modeInitialState} from './mode';
+import monitorReducer, {monitorsInitialState} from './monitors';
+import monitorLayoutReducer, {monitorLayoutInitialState} from './monitor-layout';
+import stageSizeReducer, {stageSizeInitialState} from './stage-size';
+import targetReducer, {targetsInitialState} from './targets';
+import toolboxReducer, {toolboxInitialState} from './toolbox';
+import vmReducer, {vmInitialState} from './vm';
 
-export default combineReducers({
+
+const guiInitialState = {
+    blockDrag: blockDragInitialState,
+    cards: cardsInitialState,
+    colorPicker: colorPickerInitialState,
+    customProcedures: customProceduresInitialState,
+    editorTab: editorTabInitialState,
+    mode: modeInitialState,
+    hoveredTarget: hoveredTargetInitialState,
+    stageSize: stageSizeInitialState,
+    menus: menuInitialState,
+    modals: modalsInitialState,
+    monitors: monitorsInitialState,
+    monitorLayout: monitorLayoutInitialState,
+    targets: targetsInitialState,
+    toolbox: toolboxInitialState,
+    vm: vmInitialState
+};
+
+const initPlayer = function (currentState) {
+    return Object.assign(
+        {},
+        currentState,
+        {mode: {
+            isFullScreen: currentState.mode.isFullScreen,
+            isPlayerOnly: true
+        }}
+    );
+};
+const initFullScreen = function (currentState) {
+    return Object.assign(
+        {},
+        currentState,
+        {mode: {
+            isFullScreen: true,
+            isPlayerOnly: currentState.mode.isPlayerOnly
+        }}
+    );
+};
+const guiReducer = combineReducers({
     blockDrag: blockDragReducer,
     cards: cardsReducer,
     colorPicker: colorPickerReducer,
@@ -25,7 +62,6 @@ export default combineReducers({
     editorTab: editorTabReducer,
     mode: modeReducer,
     hoveredTarget: hoveredTargetReducer,
-    intl: intlReducer,
     stageSize: stageSizeReducer,
     menus: menuReducer,
     modals: modalReducer,
@@ -33,6 +69,12 @@ export default combineReducers({
     monitorLayout: monitorLayoutReducer,
     targets: targetReducer,
     toolbox: toolboxReducer,
-    vm: vmReducer,
-    scratchPaint: ScratchPaintReducer
+    vm: vmReducer
 });
+
+export {
+    guiReducer as default,
+    guiInitialState,
+    initFullScreen,
+    initPlayer
+};
diff --git a/src/reducers/hovered-target.js b/src/reducers/hovered-target.js
index 43bf87ac0bb6ce81e4471955b31dec5f90eef4a5..d6b44f878d287df1023b44f86eec60b6cd99cbf8 100644
--- a/src/reducers/hovered-target.js
+++ b/src/reducers/hovered-target.js
@@ -43,6 +43,7 @@ const setReceivedBlocks = function (receivedBlocks) {
 
 export {
     reducer as default,
+    initialState as hoveredTargetInitialState,
     setHoveredSprite,
     setReceivedBlocks
 };
diff --git a/src/reducers/menus.js b/src/reducers/menus.js
index aac3fb852aee00712baa546ed823076422f71008..9d9ab0be9882e9001c5bd8f63195d9755a82631d 100644
--- a/src/reducers/menus.js
+++ b/src/reducers/menus.js
@@ -35,13 +35,14 @@ const closeMenu = menu => ({
 });
 const openFileMenu = () => openMenu(MENU_FILE);
 const closeFileMenu = () => closeMenu(MENU_FILE);
-const fileMenuOpen = state => state.menus[MENU_FILE];
+const fileMenuOpen = state => state.scratchGui.menus[MENU_FILE];
 const openEditMenu = () => openMenu(MENU_EDIT);
 const closeEditMenu = () => closeMenu(MENU_EDIT);
-const editMenuOpen = state => state.menus[MENU_EDIT];
+const editMenuOpen = state => state.scratchGui.menus[MENU_EDIT];
 
 export {
     reducer as default,
+    initialState as menuInitialState,
     openFileMenu,
     closeFileMenu,
     openEditMenu,
diff --git a/src/reducers/modals.js b/src/reducers/modals.js
index c373ce79610eb53010f5dc45b22ec3f6f3fc0390..ddcb5080675dcb18c1922e01c61d090766fc1c1a 100644
--- a/src/reducers/modals.js
+++ b/src/reducers/modals.js
@@ -137,6 +137,7 @@ const closeTipsLibrary = function () {
 };
 export {
     reducer as default,
+    initialState as modalsInitialState,
     openBackdropLibrary,
     openCameraCapture,
     openCostumeLibrary,
diff --git a/src/reducers/mode.js b/src/reducers/mode.js
index b158c95230dcdbd7aef38898908ddfbe690dec06..d95cb1f9905c95befaa7673484e0d6d26235da2b 100644
--- a/src/reducers/mode.js
+++ b/src/reducers/mode.js
@@ -39,7 +39,7 @@ const setPlayer = function (isPlayerOnly) {
 
 export {
     reducer as default,
-    initialState,
+    initialState as modeInitialState,
     setFullScreen,
     setPlayer
 };
diff --git a/src/reducers/monitor-layout.js b/src/reducers/monitor-layout.js
index 55cb52ee52be04b42c30ba81f5b6c604eca282e2..7e394caedbf80e3312b944e4deaa9b489fed523d 100644
--- a/src/reducers/monitor-layout.js
+++ b/src/reducers/monitor-layout.js
@@ -307,6 +307,7 @@ const removeMonitorRect = function (monitorId) {
 
 export {
     reducer as default,
+    initialState as monitorLayoutInitialState,
     addMonitorRect,
     getInitialPosition,
     moveMonitorRect,
diff --git a/src/reducers/monitors.js b/src/reducers/monitors.js
index 1b1b1f43679b0b3441b1c9f5f35d60f2f0045a20..091624225d5513812519be2692e7a99789554755 100644
--- a/src/reducers/monitors.js
+++ b/src/reducers/monitors.js
@@ -25,5 +25,6 @@ const updateMonitors = function (monitors) {
 
 export {
     reducer as default,
+    initialState as monitorsInitialState,
     updateMonitors
 };
diff --git a/src/reducers/stage-size.js b/src/reducers/stage-size.js
index 4c4a58a52191c04a1d13781c94610aa6d4675cb3..74653f19e778169509ceeb898e6d87060742ca5a 100644
--- a/src/reducers/stage-size.js
+++ b/src/reducers/stage-size.js
@@ -31,6 +31,7 @@ const setStageSize = function (stageSize) {
 
 export {
     reducer as default,
+    initialState as stageSizeInitialState,
     setStageSize,
     STAGE_SIZES
 };
diff --git a/src/reducers/targets.js b/src/reducers/targets.js
index 883fe4917869a9cde0383bc77f8504ad7e0182b1..c1f661394f827ec3e63610bde7090155160053e5 100644
--- a/src/reducers/targets.js
+++ b/src/reducers/targets.js
@@ -39,5 +39,6 @@ const updateTargets = function (targetList, editingTarget) {
 };
 export {
     reducer as default,
+    initialState as targetsInitialState,
     updateTargets
 };
diff --git a/src/reducers/toolbox.js b/src/reducers/toolbox.js
index e3317ea855e6e734aaa91d4cc2807fca93d24bbf..4e7d8d99235967d73ab86e34289328f3335d87b5 100644
--- a/src/reducers/toolbox.js
+++ b/src/reducers/toolbox.js
@@ -26,5 +26,6 @@ const updateToolbox = function (toolboxXML) {
 
 export {
     reducer as default,
+    initialState as toolboxInitialState,
     updateToolbox
 };
diff --git a/src/reducers/vm.js b/src/reducers/vm.js
index dd70f3f4fd756e17e76655ff149559cefd7ffbee..da2155cf8cd55dc52cb9f9b2d4a63e42c3ca2ff4 100644
--- a/src/reducers/vm.js
+++ b/src/reducers/vm.js
@@ -23,5 +23,6 @@ const setVM = function (vm) {
 };
 export {
     reducer as default,
+    initialState as vmInitialState,
     setVM
 };
diff --git a/test/unit/containers/sound-editor.test.jsx b/test/unit/containers/sound-editor.test.jsx
index 988aaca0f780fa61f2051eec27a0fb572fadfc55..6070b7592c914052e9bbc666d83ca6cebaf737cd 100644
--- a/test/unit/containers/sound-editor.test.jsx
+++ b/test/unit/containers/sound-editor.test.jsx
@@ -35,7 +35,7 @@ describe('Sound Editor Container', () => {
                 }
             }
         };
-        store = mockStore({vm});
+        store = mockStore({scratchGui: {vm: vm}});
     });
 
     test('should pass the correct data to the component from the store', () => {
diff --git a/test/unit/containers/sprite-selector-item.test.jsx b/test/unit/containers/sprite-selector-item.test.jsx
index a423fe81635a3685b6521a73f12824f3a5b380e0..23bda4e143de8f2ed55a7aac834cf182ffe5bdbd 100644
--- a/test/unit/containers/sprite-selector-item.test.jsx
+++ b/test/unit/containers/sprite-selector-item.test.jsx
@@ -36,7 +36,9 @@ describe('SpriteSelectorItem Container', () => {
     };
 
     beforeEach(() => {
-        store = mockStore({hoveredTarget: {receivedBlocks: false, sprite: null}});
+        store = mockStore({scratchGui: {
+            hoveredTarget: {receivedBlocks: false, sprite: null}}
+        });
         className = 'ponies';
         costumeURL = 'https://scratch.mit.edu/foo/bar/pony';
         id = 1337;