To pass, you have to control the little girl removed a certain number of tiles. When you pass the time, there will be a riddle. You can see the answer to this riddle at the end of the next level. In the beginning of the game, you have 2 seconds of invincibility time. When you want to adjust the game perspective by draging the SLIDER, you'd better pause the game.
Control: Arrows to control; Use the spacebar to switch the static mode and dynamic mode; Use the P key to switch the game to pause and run.