It's easy for kids to play and the cooperation and gem sharing warms my heart. Play generates lots of conversation around probability. Perfect for my 3 little granddaughters.

Wonderful seller and awesome product. Only complaint is that the app picks up any bright light (lamps, tv, windows) and creates lines you don't intend.

The pen draws extra lines, very difficult to use. Requires to have two smart devices and they each keep disconnecting from each other. The lag also makes the timer unusable.