Manta Research has released a unique, 3D puzzler for the iPhone and iPod touch through the iTunes App Store. Cubes [App Store] takes the traditional 3D blocks game to a new dimension by presenting the player with a fully-populated 3D block of cubes (5x5x5) and challenging him/her to clear the puzzle and achieve the level's target score.
The game is played by tapping the screen to select any group of two or more adjascent cubes and then double-tapping to have the selected chain pulled out of the puzzle, causing gravity to pull the remaining cubes "down." The puzzle can be rotated in any direction by swiping so that the player can examine the remaining cubes and perform the best scoring play sequence (the more cubes per chain, the higher the score). Cubes can connect three-dimensionally across multiple faces of the puzzle block, so careful strategy is an important component to winning.
Cubes could be well described as 3D reverse Tetris with rotation. It's an easy-paced game that's fun to play and is well suited to short, broken play sessions while on the go. At $2.99 it doesn't rob the wallet too notably, either.