More colourful than tetris
Basically, columns is just my kinda game. The classical references (however tenuous); the calming music; the gradually increasing complexity and best of all the multiplayer mode.
The numb feeling of disbelief which accompanied my completion of it, it's not exactly a trophy and fireworks. Plus, it sort of melts your eyes after a few hours.
The Bottom Line
Hmm... it's like tetris. The object of the game is to rotate groups of falling gems as they fall into the game screen, then create chains of 3 or more of the same colour. Obviously, as you progress through levels the difficulty increases.