This set includes analog and digital clocks to match, and they fit together like a puzzle which is a self-checking feature. The clocks show the time on the hour and half hour.
O(5) enjoyed setting up the cards, but she got upset when E(1) accidentally scattered a few. She wanted to quit, but I sat with her and we matched them together until we finished. Lately, she has been wanting to quit activities before she is finished, and while I don't want to force her to do "work", I also don't want her to be a quitter. It's hard to know (while in the midst of the situation) whether to insist that she finish what she started or whether to step back and just let her do her own thing. *sigh*