Tile Cascade is a tetris-replacement game you can carry with you anywhere. The goal is to make all the cells black.
Whenever you touch a cell, the colors of that cell and its adjacent cells iterate. Find the right combination of cells that will solve the puzzle.
There are three game modes--two color, three color, and four color--and there are several sizes to choose from. The game will keep track of the least number of moves you required to solve a given puzzle and will retain the best score.