XXIV! is a Tetris/Columns variant with a math-centric gimmick as its main mechanic. (Sorry for shouting! But that's the game's actual title!) Instead of dropping blocks of different colors, blocks with numbers from 1 - 12 fall, and the player's goal is to create sets that multiply to 24. So you can line up a 2 block and a 12 block beside each other, or a 3 block beside a 4 and a 2. It sounds easy but (for me a least) trying to keep track while playing is difficult. I had decent luck just dropping pieces randomly. But it's definitely a unique take on the genre so if you enjoy both Columns and math, this may be the game for you ...