Kontrola tipk:
gor - vrtenje
dol - premakne dol
levo - premakne levo
desno - premakne desno
preslednica - hitri spust na dno
n - nova igra
r - reset

Pravila:
1) Hitrost puzel = 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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