diff --git a/src/battle-scene.ts b/src/battle-scene.ts
index 4adc19374..abc732703 100644
--- a/src/battle-scene.ts
+++ b/src/battle-scene.ts
@@ -58,7 +58,8 @@ export enum Button {
 	QUICK_START,
 	AUTO,
 	SPEED_UP,
-	SLOW_DOWN
+	SLOW_DOWN,
+	FULLSCREEN
 }
 
 export interface PokeballCounts {
@@ -910,6 +911,7 @@ export default class BattleScene extends Phaser.Scene {
 					this.ui.revertMode();
 					this.playSound('select');
 					break;
+				case Mode.FULLSCREEN:
 				default:
 					return;
 			}
diff --git a/src/ui/menu-ui-handler.ts b/src/ui/menu-ui-handler.ts
index 244da125e..aeb8df6a6 100644
--- a/src/ui/menu-ui-handler.ts
+++ b/src/ui/menu-ui-handler.ts
@@ -6,7 +6,8 @@ import * as Utils from "../utils";
 
 export enum MenuOptions {
   SETTINGS,
-  ACHIEVEMENTS
+  ACHIEVEMENTS,
+  FULLSCREEN,
 }
 
 export default class MenuUiHandler extends UiHandler {
@@ -73,6 +74,11 @@ export default class MenuUiHandler extends UiHandler {
           this.scene.ui.setOverlayMode(Mode.ACHIEVEMENTS);
           success = true;
           break;
+        case MenuOptions.FULLSCREEN:
+          this.scene.scale.startFullscreen();
+          this.scene.ui.setOverlayMode(Mode.FULLSCREEN);
+          success = true;
+          break;
       }
     } else if (button === Button.CANCEL) {
       success = true;
diff --git a/src/ui/ui.ts b/src/ui/ui.ts
index 5480972c1..6022cefa0 100644
--- a/src/ui/ui.ts
+++ b/src/ui/ui.ts
@@ -38,7 +38,8 @@ export enum Mode {
   GAME_MODE_SELECT,
   MENU,
   SETTINGS,
-  ACHIEVEMENTS
+  ACHIEVEMENTS,
+  FULLSCREEN
 };
 
 const transitionModes = [
@@ -53,7 +54,8 @@ const noTransitionModes = [
   Mode.OPTION_SELECT,
   Mode.GAME_MODE_SELECT,
   Mode.MENU,
-  Mode.SETTINGS
+  Mode.SETTINGS,
+  Mode.FULLSCREEN
 ];
 
 export default class UI extends Phaser.GameObjects.Container {