@Kirvee: Thanks for your feedback. I've changed the tetris formula because there are thousands of tetris clones, so if you want to make something different you need tho change something. The Space Invaders stage is hard if you don't use SPACE key, but if you use it...
In stage 8, 9 and 10 of each level you can use the space key (it is advertised on LED sign) and this help you to complete the stages. My game is a "pinball style game" with many bonuses that you can obtain, and the letters at the bottom are one of them, if you write "drop and roll" you have a 1.000.000 bonus (but it's really hard). You are right about the lack of info about the extra stuff, I'll try to add more info into the game.
@Fordzj: This isn't the right game behavior, I think you have a speed problem; this is a 3D game so it is really CPU intensive.
@Kirvee: I'm sorry but music/sound are not present into the game for performance reasons.
 "Drop and Roll"){kind=icon}