A fun little puzzle game, especially for free. But not as compelling as some classics like Bejewelled.
Don't expect to gain your 200 Gamerscore from this game easily. The achievements are tough, and you could play for hours without getting a single one. But since the game doesn't cost you a dime, does it really matter? Great for fun in short bursts, or if you are a real puzzle game freak, you could get sucked in for hours.