Next coming block missing.
OK, That could turn the game more difficult, but why not allow player to choose?. 3 stars since I've seen Tetris games much worse than this ;-)
VERY CHALLENGING GAME.
Unfortunately there is some problem in the user interface when you click/drag pieces: I cannot move the cursor as smoothly as I want since the game seems to hang for a couple seconds (maybe checking for collisions?). Solve this, and my 3 stars will become 5! ;-)
 "Color Tetris"){kind=icon}
 "Perfect Balance 2"){kind=icon}
 "Fig. 8"){kind=icon}
 "BoomsticK"){kind=icon}
 "Crush the Castle Players Pack"){kind=icon}
 "When Penguins Attack -TD"){kind=icon}