O was very excited when she saw the rocks. We started by matching them face-up. Then I decided to play Memory with the rocks face down. I was not really expecting her to catch on the first time, but she understood immediately :) I made a big show of turning over one rock and then was thinking out loud trying to remember where the match was, and she quickly turned over the matching rock for me! I couldn't believe it :) We had a great time, and it was great practice for learning turn taking skills. I had to prompt her a few times to only turn over 2 rocks at a time, but other than that she GOT it! I'm really looking forward to playing more memory games with her, and I guess I should have started sooner. Although, I think this game is the PERFECT first memory game since the rocks are not identical and the differing sizes of the rocks give clues as to which stickers are on them.