All FOUR variations of the game are quite enjoyable, but the interface is still buggy, despite recent improvements. Stage 10 of the "Rounds" has a programming error that makes it impossible to clear the fourth line from the bottom. The scoring for "Hex" has a major mistake: if you get stuck, but restart from the menu WITHOUT clicking the "clear" icon, the new game inherits all of the points from the previous game. In other words, ALL of the high scores for "Hex" in the Game Center are utterly meaningless, because anyone can keep playing the game (and scoring) forever. The most annoying feature are the repetitive compliments that the game shows when lines are cleared. If those words could be switched off, the game would be much more enjoyable.