Type in VIDEO GAME to get a gameboy. Then play it to have the screen resemble an old Gameboy. Play it again to change back.
Gameboy Color Mode
Type in ARCADE MACHINE to get an arcade that can be played. Play it to have the game resemble a Gameboy Color game. Play it again to change back.
Old Timey Mode
Type in TIME MACHINE, and use it to make everything sepia tone, and have a piano bgm. Use it again to return to normal.