diff --git a/resources/image/icon/fullscreen.png b/resources/image/icon/fullscreen.png
new file mode 100644
index 0000000..857df12
Binary files /dev/null and b/resources/image/icon/fullscreen.png differ
diff --git a/resources/image/icon/fullscreen_white.png b/resources/image/icon/fullscreen_white.png
new file mode 100644
index 0000000..8a045d8
Binary files /dev/null and b/resources/image/icon/fullscreen_white.png differ
diff --git a/src/game/lib/fullscreen_button.js b/src/game/lib/fullscreen_button.js
new file mode 100644
index 0000000..d0934c5
--- /dev/null
+++ b/src/game/lib/fullscreen_button.js
@@ -0,0 +1,47 @@
+class FullscreenButton {
+
+	constructor(game) {
+		this.game = game;
+
+		this.game.scale.fullScreenScaleMode = Phaser.ScaleManager.EXACT_FIT;
+
+		let setting = new RoundRectButtonSetting(50, 50);
+		setting.fontStyle.boundsAlignH = "center";	// left, center. right
+		setting.fontStyle.boundsAlignV = "middle";	// top, middle, bottom
+		setting.setStrokeColor(
+			0x884444,
+			0xaa6666,
+			0xaa6666,
+			0x333333
+		);
+		setting.setButtonColor(
+			0xddaaaa,
+			0xffdddd,
+			0xffdddd,
+			0x666666
+		);
+		setting.setTextColor(
+			"#844",
+			"#a66",
+			"#a66",
+			"#333"
+		);
+
+		let button = new RoundRectButton(setting, "", () => this.clickEvent());
+		button.move(this.game.world.width - 30, 30);
+
+		let icon_fullscreen = game.add.sprite(0, 0, 'icon_fullscreen');
+		icon_fullscreen.width = 20;
+		icon_fullscreen.height = 20;
+		button.setIcon(icon_fullscreen);
+	}
+
+	clickEvent() {
+		if(this.game.scale.isFullScreen) {
+			this.game.scale.stopFullScreen();
+		} else {
+			this.game.scale.startFullScreen();
+		}
+	}
+
+}
\ No newline at end of file
diff --git a/src/game/lib/round_rect_button.js b/src/game/lib/round_rect_button.js
index 04273d6..1200914 100644
--- a/src/game/lib/round_rect_button.js
+++ b/src/game/lib/round_rect_button.js
@@ -146,29 +146,50 @@ class RoundRectButton {
 		return btnText;
 	}
 
+	setIcon(icon) {
+		this.buttonIcon = this.button.addChild(icon);
+		this.buttonIcon.x = this.button.width / 2;
+		this.buttonIcon.y = this.button.height / 2;
+		this.buttonIcon.anchor.setTo(0.5, 0.5);
+
+		this.mouseOut();
+	}
+
 
 	mouseOut() {
 		this.text.fill = this.setting.textColors.out;
 		this.buttonStroke.tint = this.setting.strokeColors.out;
 		this.button.tint = this.setting.buttonColors.out;
+		if(typeof this.buttonIcon !== "undefined") {
+			this.buttonIcon.tint = this.setting.strokeColors.out;
+		}
 	}
 
 	mouseOver() {
 		this.text.fill = this.setting.textColors.over;
 		this.buttonStroke.tint = this.setting.strokeColors.over;
 		this.button.tint = this.setting.buttonColors.over;
+		if(typeof this.buttonIcon !== "undefined") {
+			this.buttonIcon.tint = this.setting.strokeColors.over;
+		}
 	}
 
 	mouseDown() {
 		this.text.fill = this.setting.textColors.down;
 		this.buttonStroke.tint = this.setting.strokeColors.down;
 		this.button.tint = this.setting.buttonColors.down;
+		if(typeof this.buttonIcon !== "undefined") {
+			this.buttonIcon.tint = this.setting.strokeColors.down;
+		}
 	}
 
 	buttonDisabled() {
 		this.text.fill = this.setting.textColors.disabled;
 		this.buttonStroke.tint = this.setting.strokeColors.disabled;
 		this.button.tint = this.setting.buttonColors.disabled;
+		if(typeof this.buttonIcon !== "undefined") {
+			this.buttonIcon.tint = this.setting.strokeColors.disabled;
+		}
 	}
 
 
diff --git a/src/game/login/login.js b/src/game/login/login.js
index 896ac7a..61ccc0b 100644
--- a/src/game/login/login.js
+++ b/src/game/login/login.js
@@ -71,6 +71,11 @@ let Login = {
 
 		let startButton = new RoundRectButton(setting, "시작", this.startMenu);
 		startButton.move(game.world.centerX, game.world.centerY + 140);
+
+		icon_fullscreen = game.add.sprite(0, 0, 'icon_fullscreen');
+		icon_fullscreen.width = 20;
+		icon_fullscreen.height = 20;
+		startButton.setIcon(icon_fullscreen);
 	},
 
 	startMenu: function() {
diff --git a/src/game/menu/menu_app.js b/src/game/menu/menu_app.js
index cec401e..e1f08e8 100644
--- a/src/game/menu/menu_app.js
+++ b/src/game/menu/menu_app.js
@@ -3,16 +3,25 @@
 
 let MenuApp = {
 
+	preload: function() {
+		game.load.image('icon_fullscreen', '../../../resources/image/icon/fullscreen_white.png');
+	},
+
 	create: function() {
 		this.game.stage.backgroundColor = '#4d4d4d';
 
 		let backButton = new BackButton( () => {
+			sessionStorage.removeItem("playerName");
+			sessionStorage.removeItem("playerUserID");
+
 			location.href = '../../web/client/login.html';
 		});
 
+		let fullscreenButton = new FullscreenButton(this.game);
+
 		let screenBottom = new ScreenBottom(game);
 		screenBottom.makeBottomLine();
-		screenBottom.printBottomLeftText("게임 진행 정보");
+		// screenBottom.printBottomLeftText("게임 진행 정보");
 		screenBottom.printBottomCenterText("메뉴");
 		screenBottom.printBottomRightText(playerName);
 
diff --git a/src/web/client/menu_app.html b/src/web/client/menu_app.html
index 062ddd1..98bf0db 100644
--- a/src/web/client/menu_app.html
+++ b/src/web/client/menu_app.html
@@ -15,6 +15,7 @@
 		<script src="../../game/lib/input_type_text.js"></script>
 		<script src="../../game/lib/round_rect_button.js"></script>
 		<script src="../../game/lib/back_button.js"></script>
+		<script src="../../game/lib/fullscreen_button.js"></script>
 		<script src="../../game/lib/screen_bottom.js"></script>
 
 		<!-- source files -->