Every 108 minutes, the button must be pushed.
Don't hit the walls, or you'll sink!
Press and hold the button for a long as you can endure. You might even get on the leaderboard!
Me: "What time is it?"
Dad: "I don't know... it keeps changing."
"This sentence is false."
Is the sentence true or false?
Travel through all the doorways exactly once.
Add a single toothpick to form a mathematically true equality.