Tetris-type puzzle game offers tricky challenges.
While the premise is a relatively simple one, the level of difficultly does ramp up quite quickly; thus limiting who can play the game. The controls are very well executed with blocks being moved by tapping them, which adds them to a holding queue on the side of the screen. To place them simple tap an empty location. Groups of blocks can be moved by drawing on them, providing there is enough room in the queue.
Each level features an unlockable "dark" version that can be bought with coins earned during play. These dark levels are even tougher than the standard levels, and will keep people challenged for quite some time. Other things to keep people playing include unlocking music from classic games like Mario Brothers.