Acuity Games today introduces One & Only for iOS, the 16th game in their growing line-up of brain health assessment based brain games. One & Only is played by finding the only unique tile color in each round of the game. Finish the last round with enough correct tile choices to win the game. One & Only allows you to create new games with configurable tile colors and shapes, grid sizes, number of rounds, and number of correct taps needed to win the game.