Thanks.
Maybe create grid and move blocks for 50 px?
On end of game final screen (user WIN):
On start game we see Level 1 block from set speed to 100. If level 1 blocks collision on gameFloor then show level 2 blocks where speed blocks = 150. Level 3 this is 2 block (not 3), and we must put this blocks on blocks level 2. We must create tower. We have 3 lives (if block fall to gameFloor then subtract 1 from lives - if lives <= 0 eng game).
Do you have idea?
Sorry for me english and thanks for help