diff --git a/src/extension-support/extension-manager.js b/src/extension-support/extension-manager.js
index 86a335989..11b6f3366 100644
--- a/src/extension-support/extension-manager.js
+++ b/src/extension-support/extension-manager.js
@@ -17,6 +17,7 @@ const Scratch3VideoSensingBlocks = require('../extensions/scratch3_video_sensing
 const Scratch3Speech2TextBlocks = require('../extensions/scratch3_speech2text');
 const Scratch3Ev3Blocks = require('../extensions/scratch3_ev3');
 const Scratch3MakeyMakeyBlocks = require('../extensions/scratch3_makeymakey');
+const Scratch3GoForceBlocks = require('../extensions/scratch3_goforce');
 
 const builtinExtensions = {
     pen: Scratch3PenBlocks,
@@ -28,7 +29,8 @@ const builtinExtensions = {
     videoSensing: Scratch3VideoSensingBlocks,
     speech2text: Scratch3Speech2TextBlocks,
     ev3: Scratch3Ev3Blocks,
-    makeymakey: Scratch3MakeyMakeyBlocks
+    makeymakey: Scratch3MakeyMakeyBlocks,
+    goforce: Scratch3GoForceBlocks
 };
 
 /**
diff --git a/src/extensions/scratch3_goforce/index.js b/src/extensions/scratch3_goforce/index.js
new file mode 100644
index 000000000..d7ae9b65b
--- /dev/null
+++ b/src/extensions/scratch3_goforce/index.js
@@ -0,0 +1,190 @@
+const ArgumentType = require('../../extension-support/argument-type');
+const BlockType = require('../../extension-support/block-type');
+const log = require('../../util/log');
+const cast = require('../../util/cast');
+const formatMessage = require('format-message');
+const BLE = require('../../io/ble');
+const Base64Util = require('../../util/base64-util');
+
+/**
+ * Icon png to be displayed at the left edge of each extension block, encoded as a data URI.
+ * @type {string}
+ */
+// eslint-disable-next-line max-len
+const blockIconURI = 'data:image/png;base64,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';
+
+const CompareOptionsMenu = ['>', '<', '='];
+
+const DirectionOptionsMenu = ['x', 'y', 'z'];
+
+
+/**
+ * Scratch 3.0 blocks to interact with a GoForce peripheral.
+ */
+class Scratch3GoForceBlocks {
+
+    /**
+     * Construct a set of GoForce blocks.
+     * @param {Runtime} runtime - the Scratch 3.0 runtime.
+     */
+    constructor (runtime) {
+        /**
+         * The Scratch 3.0 runtime.
+         * @type {Runtime}
+         */
+        this.runtime = runtime;
+    }
+
+    /**
+     * @returns {object} metadata for this extension and its blocks.
+     */
+    getInfo () {
+        return {
+            id: Scratch3GoForceBlocks.EXTENSION_ID,
+            name: Scratch3GoForceBlocks.EXTENSION_NAME,
+            blockIconURI: blockIconURI,
+            showStatusButton: true,
+            blocks: [
+                {
+                    opcode: 'whenAccelerationCompare',
+                    text: formatMessage({
+                        id: 'ev3.whenAccelerationCompare',
+                        default: 'when acceleration [DIRECTION] [COMPARE] [VALUE] m/s\u{00B2}',
+                        description: 'when the value measured by the acceleration sensor is compared to some value'
+                    }),
+                    blockType: BlockType.HAT,
+                    arguments: {
+                        DIRECTION: {
+                            type: ArgumentType.STRING,
+                            menu: 'directionOptions',
+                            defaultValue: 0
+                        },
+                        COMPARE: {
+                            type: ArgumentType.STRING,
+                            menu: 'compareOptions',
+                            defaultValue: 0
+                        },
+                        VALUE: {
+                            type: ArgumentType.NUMBER,
+                            defaultValue: 5
+                        }
+                    }
+                },
+                {
+                    opcode: 'whenTiltCompare',
+                    text: formatMessage({
+                        id: 'ev3.whenTitleCompare',
+                        default: 'when tilt [DIRECTION] [COMPARE] [VALUE] rad/s',
+                        description: 'when the value measured by the acceleration sensor is compared to some value'
+                    }),
+                    blockType: BlockType.HAT,
+                    arguments: {
+                        DIRECTION: {
+                            type: ArgumentType.STRING,
+                            menu: 'directionOptions',
+                            defaultValue: 0
+                        },
+                        COMPARE: {
+                            type: ArgumentType.STRING,
+                            menu: 'compareOptions',
+                            defaultValue: 0
+                        },
+                        VALUE: {
+                            type: ArgumentType.NUMBER,
+                            defaultValue: 5
+                        }
+                    }
+                },
+                {
+                    opcode: 'whenForceCompare',
+                    text: formatMessage({
+                        id: 'ev3.whenForceCompare',
+                        default: 'when force [COMPARE] [VALUE] N',
+                        description: 'when the value measured by the force sensor is compared to some value'
+                    }),
+                    blockType: BlockType.HAT,
+                    arguments: {
+                        COMPARE: {
+                            type: ArgumentType.STRING,
+                            menu: 'compareOptions',
+                            defaultValue: 0
+                        },
+                        VALUE: {
+                            type: ArgumentType.NUMBER,
+                            defaultValue: 5
+                        }
+                    }
+                },
+                {
+                    opcode: 'getAcceleration',
+                    text: formatMessage({
+                        id: 'ev3.getAcceleration',
+                        default: 'acceleration [DIRECTION]',
+                        description: 'gets acceleration'
+                    }),
+                    blockType: BlockType.REPORTER,
+                    arguments: {
+                        DIRECTION: {
+                            type: ArgumentType.STRING,
+                            menu: 'directionOptions',
+                            defaultValue: 0
+                        }
+                    }
+                },
+                {
+                    opcode: 'getTilt',
+                    text: formatMessage({
+                        id: 'ev3.getTitle',
+                        default: 'tilt [DIRECTION]',
+                        description: 'gets tilt'
+                    }),
+                    blockType: BlockType.REPORTER,
+                    arguments: {
+                        DIRECTION: {
+                            type: ArgumentType.STRING,
+                            menu: 'directionOptions',
+                            defaultValue: 0
+                        }
+                    }
+                },
+                {
+                    opcode: 'getForce',
+                    text: formatMessage({
+                        id: 'ev3.getForce',
+                        default: 'force',
+                        description: 'gets force'
+                    }),
+                    blockType: BlockType.REPORTER
+                }
+            ],
+            menus: {
+                directionOptions: this._formatMenu(DirectionOptionsMenu),
+                compareOptions: this._formatMenu(CompareOptionsMenu),
+                motorPorts: this._formatMenu(Ev3MotorMenu),
+                sensorPorts: this._formatMenu(Ev3SensorMenu)
+            }
+        };
+    }
+
+    whenAccelerationCompare (args) {
+        return Promise.resolve();
+    }
+    whenTiltCompare (args) {
+        return Promise.resolve();
+    }
+    whenForceCompare (args) {
+        return Promise.resolve();
+    }
+    getAcceleration (args) {
+        return Promise.resolve();
+    }
+    getTilt (args) {
+        return Promise.resolve();
+    }
+    getForce (args) {
+        return Promise.resolve();
+    }
+
+}
+
+module.exports = Scratch3GoForceBlocks;