You probably know the game already, if you didn't, come have a try:
https://www.habbo.nl/room/37453988
One game takes 2minutes, each game has 3levels,
- First 30seconds: 1 tile per 1.5 seconds
- Between 30-80seconds: 1 tile per 1 second
- Between 80-120seconds: 1 tile per 0.5 seconds
Design: