A spot-the-image game, using the DS's twin screens. Hold the DS on it's side, and the left and right sides display a slightly different image. Use the stylus to note the differences. There are two sets of powerups: hourglasses, which completely refresh your time needed for the level, and magnifying glasses, which automatically find one difference for you. Each story begins with a certain number of these powerups, with no way to replenish them.
There are three difficulty levels, which have five, six, or seven differences to find in each image, and three stories: Dreams, Goldilocks, and Robin Hood. Multiplayer is also included, where you can either help another player find the differences, or compete to find the differences faster.