Steemhunt: invert application.

Fans of brain-teasing puzzles like Reversi, Sudoku, and Rubik's Cubes will enjoy the tile-turning game Invert.

To flip a specific tile pattern, you press buttons around a tile grid in Invert. Using as few moves as possible, your objective is to make all tiles the same color. It's simple to solve, but not very well.

Finish levels in a predetermined number of moves. Settle levels with time as the opponent. You can use as many moves as you like.
Similar to Challenge Mode, but much more difficult. A lot harder, actually.

Image credit application