What's the difference between a hippo and a zippo? One is really heavy, the other is a little lighter.
Press and hold the button for a long as you can endure. You might even get on the leaderboard!
Don't hit the walls, or you'll sink!
Every 108 minutes, the button must be pushed.
The longer you wait to reset the sign to zero, the higher your score. But don't wait too long, or someone else might reset it!