2 in 1 Stacking Cups is the smartest version of a classic stacking toy, that helps develop cognitive skills, logical association, and hand-eye coordination. Game 1. Stack & Learn: 5 cups in decreasing sizes to stack. Game 2. Sort: 5 different colored shapes to insert in the right hole at the top of each cup. The cups can be placed inside each other, they are decorated with numbers from 1 to 5, and with the correspondent shape, to stimulate logical association and hand-eye coordination. Smart2Play toys transform amusing creative experiences into fundamental cognitive achievements.