diff --git a/src/game/lib/keyboard_shortcut.js b/src/game/lib/keyboard_shortcut.js
new file mode 100644
index 0000000..02956f9
--- /dev/null
+++ b/src/game/lib/keyboard_shortcut.js
@@ -0,0 +1,58 @@
+function KeyboardShortcut() {
+	console.log("KeyboardShortcut");
+
+	this.keyHandlerMapper = {};
+	console.log(this.keyHandlerMapper[Phaser.KeyCode.ESC]);
+
+	game.input.keyboard.addCallbacks(this, this.keyDown, this.keyUp, null);
+};
+
+KeyboardShortcut.prototype.addCallback = function(keyCode, keyDownHandler, keyUpHandler, callerClassName) {
+	if(this.keyHandlerMapper[keyCode] != undefined) {
+		this.keyHandlerMapper[keyCode] = null;
+	}
+
+	this.keyHandlerMapper[keyCode] = {
+		"keyDownHandler": keyDownHandler,
+		"keyUpHandler": keyUpHandler,
+		"callerClassName": callerClassName
+	}
+
+	// console.log(this.keyHandlerMapper);
+}
+
+KeyboardShortcut.prototype.keyDown = function(char) {
+	// var keyCode = char.code;
+	var keyCode = char.keyCode;
+	// console.log(keyCode + " is pressed");
+
+	if(this.keyHandlerMapper[keyCode] == undefined)
+		return;
+
+	var keyMapper = this.keyHandlerMapper[keyCode];
+	var keyDownHandler = keyMapper["keyDownHandler"];
+	if(keyDownHandler == undefined)
+		return;
+
+	if(isDebugMode())
+		console.log(keyCode + " key is down (" + keyMapper["callerClassName"] + ")");
+	keyDownHandler();
+}
+
+KeyboardShortcut.prototype.keyUp = function(char) {
+	// var keyCode = char.code;
+	var keyCode = char.keyCode;
+	// console.log(keyCode + " is up");
+
+	if(this.keyHandlerMapper[keyCode] == undefined)
+		return;
+
+	var keyMapper = this.keyHandlerMapper[keyCode];
+	var keyUpHandler = keyMapper["keyUpHandler"];
+	if(keyUpHandler == undefined)
+		return;
+
+	if(isDebugMode())
+		console.log(keyCode + " key is up (" + keyMapper["callerClassName"] + ")");
+	keyUpHandler();
+}
diff --git a/src/game/menu/menu_typing_practice.js b/src/game/menu/menu_typing_practice.js
index c5fd870..2486288 100644
--- a/src/game/menu/menu_typing_practice.js
+++ b/src/game/menu/menu_typing_practice.js
@@ -39,11 +39,17 @@ var MenuTypingPractice = {
 		// );
 
 
+		this.keyboardShortcut = new KeyboardShortcut();
+		this.keyboardShortcut.addCallback(
+			Phaser.KeyCode.ESC,	// keyCode
+			null,	// keyDownHandler
+			(function() { this.back(); }).bind(this),	// keyUpHandler
+			"menu_typing_practice"	// callerClassName
+		);
+
 		// top ui
 		var screenTopUI = new ScreenTopUI();
-		screenTopUI.makeBackButton( function() {
-			location.href = '../../web/client/menu_app.html';
-		});
+		screenTopUI.makeBackButton( (function() { this.back(); }).bind(this) );
 		screenTopUI.makeFullScreenButton();
 
 
@@ -76,6 +82,10 @@ var MenuTypingPractice = {
 		this.makeActiveTypingPracticeAppButtons();
 	},
 
+	back: function() {
+		location.href = '../../web/client/menu_app.html';
+	},
+
 
 	makeActiveTypingPracticeAppButtons: function() {
 		var dbConnectManager = new DBConnectManager();
diff --git a/src/web/client/menu_typing_practice.html b/src/web/client/menu_typing_practice.html
index 909c267..fbd767d 100644
--- a/src/web/client/menu_typing_practice.html
+++ b/src/web/client/menu_typing_practice.html
@@ -14,6 +14,7 @@
 		<script src="../../game/global/global_variables.js"></script>
 
 		<!-- library source files -->
+		<script src="../../game/lib/keyboard_shortcut.js"></script>
 		<script src="../../game/lib/input_type_text.js"></script>
 		<script src="../../game/lib/button/round_rect_button.js"></script>
 		<script src="../../game/lib/button/back_button.js"></script>