Monkey Go
The game 12 MiniBattles uses a single button for all actions. Also it has physics that affect movement in every mini-game.
Pick a mini-game with a friend, and press the button to act Fast.
The game uses a single button control scheme for all contests. The physics based movement affects how characters move during play.
Watch the physics to time your button press correctly. Focus on the physics then just random clicking to succeed.
Q: What controls are used? A: A single button controls all actions.
Q: What is one stated feature? A: Physics based movement.
Q: What is the main mechanic? A: Using a single button.