1. Bake cake in a 9-inch square pan according to package directions. Let cool completely; frost with icing.
2. Soften six each red, green, yellow, and blue fruit chews in the microwave for a few seconds on high. Roll out to 1/8-inch thickness. Use 1-1/4-inch round cookie cutter to make circles. Arrange circles in rows to mimic a Twister board.