This is a simple extension into the third dimension of a typical match-x game. You start with a vaguely cube shaped pile of blocks and then fire predetermined color blocks onto the mass attempting to connect at least four of a color, causing them to be removed. In it's base mode each fired block causes the mass to grow while matching blocks causes it to shrink. Take too long or fire too many blocks without clearing any and you'll reach critical mass and lose.
The interesting thing about this game is that at it's heart it seems to want to be a competitive game. In the base mode there are only 10 levels and they have to be completed in one sitting to get a final score and attempt to get on the leaderboard and this leaderboard seems to be what the developers hoped would keep you coming back. Personally I'm not really a fan of this type puzzle game and the competitive aspects are not a draw to me. If you enjoy doing something multiple times in an attempt to hone your skill then this will be well worth the price of entry. If, like me, you're looking for a more encapsulated experience then its probably best to move on.