Just got these letter stamps and LAD spotted them. So we had to open them. This kept him busy for at least 30 minutes. Man his fingernails need trimmed!!! We only temporarily lost 3 letters when we were putting them away. Do you think that's confusing to see the letters in reverse? He used his markers and stamped some, so I think he sort of has a clue. Didn't seem to stop him from playing with them. And he knew which letters were which, with exception of some lowercase b,d, and qs. But they are tricky anyway!