Tetris

Controllers:
šipka nahoru - rotace
dolů - zrychlí
vlevo - posune tvar vlevo
vpravo - posune tvar vpravo
space - fall to the bottom
n - nová hra
r - reset

Rules:
1) Puzzle speed = 80+700/level miliseconds, the smaller value the faster puzzle falls
2) If puzzles created in current level >= 10+level*2 then increase level
3) After puzzle falling score is increased by 1000*level*linesRemoved
4) Each "down" action increases score by 5+level (pressing space counts as multiple down actions)

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