diff --git a/lib/skulpt/microbit/__init__.js b/lib/skulpt/microbit/__init__.js
index 179081d..43f1ddc 100644
--- a/lib/skulpt/microbit/__init__.js
+++ b/lib/skulpt/microbit/__init__.js
@@ -124,11 +124,11 @@ var accelerometer = function(name) {
 	});
 
 	mod.get_y = new Sk.builtin.func(function() {
-		return new Sk.builtin.number(mod.data.y);
+		return new Sk.builtin.nmber(mod.data.y);
 	});
 
 	mod.get_z = new Sk.builtin.func(function() {
-		return new Sk.builtin.number(mod.data.z);
+		return new Sk.builtin.nmber(mod.data.z);
 	});
 
 	mod.get_values = new Sk.builtin.func(function() {
@@ -1424,9 +1424,10 @@ var $builtinmodule = function (name) {
 			html += ' <span id="mb_pin_detail"></span>';
 			html += '</div>';
 			html += '<div id="mb_tabs_accelerometer">';
-			html += 'x: <span id="mb_acc_value_x">0</span><div class="mb_slider" id="mb_acc_slider_x"></div>';
-			html += 'y: <span id="mb_acc_value_y">0</span><div class="mb_slider" id="mb_acc_slider_y"></div>';
-			html += 'z: <span id="mb_acc_value_z">9</span><div class="mb_slider" id="mb_acc_slider_z"></div>';
+			html += 'x: <span id="mb_acc_value_x" class="mb_slider_acc">0</span><div class="mb_slider" id="mb_acc_slider_x"></div>';
+			html += 'y: <span id="mb_acc_value_y" class="mb_slider_acc">0</span><div class="mb_slider" id="mb_acc_slider_y"></div>';
+			html += 'z: <span id="mb_acc_value_z" class="mb_slider_acc">9</span><div class="mb_slider" id="mb_acc_slider_z"></div>';
+			html += '<span id="accel_check"><input type="checkbox" name="accel_check"><label for="accel_check">Move accelerometer with mouse</label></span>';
 			html += '<h3>Gestures</h3>';
 			html += '<span class="mb_help_link mb_gesture">up</span>';
 			html += '<span class="mb_help_link mb_gesture">down</span>';
@@ -1721,6 +1722,40 @@ var $builtinmodule = function (name) {
 				step: 1,
 				change: sliderChange
 			}).on("slide", sliderChange);
+
+			var accel_mouse_timer = null;
+			$('#accel_check :checkbox').change(function() {
+				if (this.checked) {
+					var mousemove_enabled = false;
+					const offset = $('#microbit').offset();
+					const height = $('#microbit').height();
+					const width = $('#microbit').width();
+					$('#microbit').mousemove(function (event) {
+						// debounce
+						if (!mousemove_enabled) {
+							return;
+						}
+						// Micro:bit accel values are +/- 2000, let's do half for sensitivity
+						const x = ((event.pageX - offset.left) / width) * 2000 - 1000;
+						const y = ((event.pageY - offset.top) / height) * 2000 - 1000;
+						mod.accelerometer.$d.data.x = x;
+						mod.accelerometer.$d.data.y = y;
+
+						$('#mb_acc_slider_x').slider('value', x);
+						$('#mb_acc_slider_y').slider('value', y);
+						$('#mb_acc_value_x').text(Math.floor(x));
+						$('#mb_acc_value_y').text(Math.floor(y));
+						mousemove_enabled = false;
+					});
+
+					accel_mouse_timer = window.setInterval(function () {
+						mousemove_enabled = true;
+					}, 30);
+				} else {
+					$('#microbit').off('mousemove');
+					window.clearInterval(accel_mouse_timer);
+				}
+			});
 			$('#mb_therm_slider').slider({
 				value: 23,
 				min: 0,
diff --git a/lib/skulpt/microbit/mb.css b/lib/skulpt/microbit/mb.css
index 1f8b26d..adc3707 100644
--- a/lib/skulpt/microbit/mb.css
+++ b/lib/skulpt/microbit/mb.css
@@ -98,7 +98,7 @@
 	height: 100px;
 	line-height: 100px;
 	text-align: center;
-	vertical-align: center;
+	vertical-align: middle;
 	background-image: url('compassbk.jpg');
 	position: relative;
 }
@@ -119,6 +119,10 @@
 	display: inline-block;
 	margin: 0px 10px 0px 10px;
 }
+.mb_slider_acc {
+    display: inline-block;
+    min-width: 2.5em;
+}
 #mb_gesture_list {
 	border-style: solid;
 	border-width: 1px;
@@ -127,16 +131,16 @@
 }
 .mb_current_gesture {
 	color: #F00;
-	margin; 1em;
+	margin: 1em;
 }
 .mb_active_gesture_down {
 	transform: rotate(180deg);
 }
 .mb_active_gesture_left, .mb_active_gesture_right {
-	-webkit-transform: rotateY(80deg);transform: rotateY(80deg);
+	transform: rotateY(80deg);
 }
 .mb_active_gesture_facedown {
-	-webkit-transform: rotateY(180deg);transform: rotateY(180deg);
+	transform: rotateY(180deg);
 }
 .mb_active_gesture_freefall {
 	transform: scale(0.2,0.2);