Do you Reckon? Reckon is a game of concentration. Tap and match identical tiles to clear the board. Each game is unique as the location of tiles is always random. Configure settings to make the game more difficult/interesting as your skills progress. Enable gravity to make it more difficult to locate previously uncovered tiles. Enable bombs which could end the game when tapped too many times. Enable a timer to force the game to end after a selected number of seconds (beat the clock!). Vary the graphics displayed on the tiles: icons, letters, numbers, and colors are currently available. A fun and addicting game to exercise your memory muscle.

http://appshopper.com/games/reckon-free