Alexey Pajitnov, co-creator of the classic and endlessly iterated game Tetris, has tried his hand at iOS development. Marbly was released on the App Store, tasking players with matching marbles to clear the board. As you might expect from Pajitnov, it's a simple puzzle concept that turns devilishly complex.
The game is available on the App Store (via Cnet) as a free download. It boasts 180 stages in all, with a series of challenge types like Daily, Time, and Move challenges. This game is being put out by Wildsnake Software, which Pajitnov joined way back in 2005 after designing Hexic for Microsoft.