One Button Vania is a Flash platformer with one particular gimmick: there is only one button to use to control the character. You play as a knight that's been tasked to save the world from an invasion of monsters led by a mysterious evil. There's one catch to this knight, however: he's constantly walking and he can't control the direction in which he moves. Master the one-button controls as you collect special skills and powerups that you can switch with the press of another button. (The knight can still only use one skill at a time, which is controlled by one button.)

Mikewillplays completes this game and saves the world from clowns in record time with the use of clipping and out-of-bound glitches to skip portions of certain levels.