diff --git a/src/game/lib/experience_app_timer.js b/src/game/lib/experience_app_timer.js
new file mode 100644
index 0000000..bbffbcf
--- /dev/null
+++ b/src/game/lib/experience_app_timer.js
@@ -0,0 +1,77 @@
+function ExperienceAppTimer() {
+	if(!isExperienceMaestroAccount()) {
+		return;
+	}
+
+	this.leftTime = ExperienceAppTimer.DEFAULT_LEFT_TIME_SEC;
+	this.onTimeOver = null;
+
+	var timeLeftText = game.add.text(
+		game.world.centerX + ExperienceAppTimer.OFFSET_POS_X,
+		game.world.height - ExperienceAppTimer.OFFSET_POS_Y,
+		"앱 체험 종료까지 ",
+		this.getFontStyle()
+	);
+	timeLeftText.anchor.set(1, 0.5);
+	timeLeftText.alpha = 0.5;
+	// timeLeftText.stroke = '#000';
+	// timeLeftText.strokeThickness = 3;
+
+	this.timerText = game.add.text(
+		game.world.centerX + ExperienceAppTimer.OFFSET_POS_X,
+		game.world.height - ExperienceAppTimer.OFFSET_POS_Y,
+		this.getLeftTimeText(),
+		this.getFontStyle()
+	);
+	this.timerText.anchor.set(0, 0.5);
+	// this.timerText.stroke = '#000';
+	// this.timerText.strokeThickness = 3;
+
+	// this.setTimeLimit(4);
+
+	this.loopTimer = game.time.events.loop(Phaser.Timer.SECOND, this.updateTimer, this);
+};
+
+
+ExperienceAppTimer.prototype.getFontStyle = function() {
+	return { font: "24px Arial", fill: "#f86", align: "left", boundsAlignH: "left", boundsAlignV: "bottom" };
+}
+
+ExperienceAppTimer.prototype.getLeftTimeText = function() {
+	return this.leftTime + " 초";
+}
+
+ExperienceAppTimer.prototype.setTimeOverListener = function(onTimeOver) {
+	this.onTimeOver = onTimeOver;
+}
+
+ExperienceAppTimer.prototype.setTimeLimit = function(leftTime) {
+	this.leftTime = leftTime;
+	this.timerText.text = this.getLeftTimeText();
+}
+
+ExperienceAppTimer.prototype.updateTimer = function() {
+	this.leftTime--;
+
+	if(this.leftTime == 5) {
+		this.timerText.fill = "#f42";
+	} else if(this.leftTime == 0) {
+		this.timerText.fill = "#f00";
+	}
+
+	if(this.leftTime > 0) {
+		this.timerText.text = this.getLeftTimeText();
+	} else {
+		this.timerText.text = this.getLeftTimeText();
+
+		if(this.loopTimer != null)
+			game.time.events.remove(this.loopTimer);
+
+		if(this.onTimeOver != null)
+			this.onTimeOver();
+	}
+}
+
+ExperienceAppTimer.DEFAULT_LEFT_TIME_SEC	= 20;
+ExperienceAppTimer.OFFSET_POS_X				= 60;
+ExperienceAppTimer.OFFSET_POS_Y				= 60;
\ No newline at end of file
diff --git a/src/game/mouse/space_invaders/game.js b/src/game/mouse/space_invaders/game.js
index af1401d..faf16bc 100644
--- a/src/game/mouse/space_invaders/game.js
+++ b/src/game/mouse/space_invaders/game.js
@@ -5,6 +5,11 @@ var Game = {
 
 		sessionStorageManager.setIsNewBestRecord(false);
 
+		var experienceAppTimer = new ExperienceAppTimer();
+		experienceAppTimer.setTimeOverListener(
+			(function() { this.gameOver(); }).bind(this)
+		);
+
 		// top ui
 		var screenTopUI = new ScreenTopUI();
 		screenTopUI.makeBackButton( function() {
diff --git a/src/game/typing/practice/game.js b/src/game/typing/practice/game.js
index 5597930..18416e6 100644
--- a/src/game/typing/practice/game.js
+++ b/src/game/typing/practice/game.js
@@ -1,4 +1,5 @@
 var TypingPractice = {
+
 	create: function() {
 		var self = this;
 
@@ -7,6 +8,11 @@ var TypingPractice = {
 		this.initTypingData();
 		sessionStorageManager.setIsNewBestRecord(false);
 
+		var experienceAppTimer = new ExperienceAppTimer();
+		experienceAppTimer.setTimeOverListener(
+			(function() { this.gameOver(); }).bind(this)
+		);
+
 		game.stage.backgroundColor = '#4d4d4d';
 
 		// top ui
diff --git a/src/game/typing/test/game.js b/src/game/typing/test/game.js
index 06dbd8a..7f7041b 100644
--- a/src/game/typing/test/game.js
+++ b/src/game/typing/test/game.js
@@ -1,11 +1,16 @@
 var TypingTest = {
 
 	create: function() {
-		self = this;
+		var self = this;
 
 		this.initTypingData();
 		sessionStorageManager.setIsNewBestRecord(false);
 
+		var experienceAppTimer = new ExperienceAppTimer();
+		experienceAppTimer.setTimeOverListener(
+			(function() { this.gameOver(); }).bind(this)
+		);
+
 		game.stage.backgroundColor = '#4d4d4d';
 
 		// top ui
diff --git a/src/web/client/space_invaders.html b/src/web/client/space_invaders.html
index 2c739ff..4903ac9 100644
--- a/src/web/client/space_invaders.html
+++ b/src/web/client/space_invaders.html
@@ -28,6 +28,7 @@
 		<script src="../../game/lib/db_connect_manager.js"></script>
 		<script src="../../game/lib/screen_top_ui.js"></script>
 		<script src="../../game/lib/screen_bottom_ui.js"></script>
+		<script src="../../game/lib/experience_app_timer.js"></script>
 		<script src="../../game/lib/game_over_text.js"></script>
 
 		<!-- Space Invaders : source files -->
diff --git a/src/web/client/typing_practice.html b/src/web/client/typing_practice.html
index 456e6a1..be908a5 100644
--- a/src/web/client/typing_practice.html
+++ b/src/web/client/typing_practice.html
@@ -26,6 +26,7 @@
 		<script src="../../game/lib/db_connect_manager.js"></script>
 		<script src="../../game/lib/screen_top_ui.js"></script>
 		<script src="../../game/lib/screen_bottom_ui.js"></script>
+		<script src="../../game/lib/experience_app_timer.js"></script>
 		<script src="../../game/lib/game_over_text.js"></script>
 		<script src="../../game/lib/animal.js"></script>
 
diff --git a/src/web/client/typing_test.html b/src/web/client/typing_test.html
index 75aaee3..ce1abe9 100644
--- a/src/web/client/typing_test.html
+++ b/src/web/client/typing_test.html
@@ -26,6 +26,7 @@
 		<script src="../../game/lib/db_connect_manager.js"></script>
 		<script src="../../game/lib/screen_top_ui.js"></script>
 		<script src="../../game/lib/screen_bottom_ui.js"></script>
+		<script src="../../game/lib/experience_app_timer.js"></script>
 		<script src="../../game/lib/game_over_text.js"></script>
 		<script src="../../game/lib/animal.js"></script>
 
diff --git a/src/web/module/maestro_section_main.html b/src/web/module/maestro_section_main.html
index 78c5ec3..319cc25 100644
--- a/src/web/module/maestro_section_main.html
+++ b/src/web/module/maestro_section_main.html
@@ -104,7 +104,7 @@ function deactivateApp(appID) {
 				<br/>
 				▶ 체험판 [마에스트로 앱] 기능 제한 안내<br/>
 				- 타자, 마우스 앱 연습 결과가 서버에 저장되지 않습니다.<br/>
-				- 모든 컨텐츠는 30초만 플레이하실 수 있습니다.<br/>
+				- 모든 컨텐츠는 20초만 플레이하실 수 있습니다.<br/>
 			</div>
 			<div class="modal-footer">
 				<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>