Review on MightyMind Original Kids' Cognitive Puzzle 7437 KN CP by Joseph Hall

2.5 year old son is already interested and has been wanting to play with him for 3 days! That. I usually finish one part of the puzzle and he's happy to "help" with the rest. :) I'm sure it will take years (to keep him busy). I'm glad I didn't go for the easier puzzles (like Melissa and Doug's version) which I'm sure he can solve in 30 minutes. and lose interest. The plastic material isn't an issue I was initially worried about. Problems: 1) the pieces are a bit small. and no redundancy. I'm afraid he'll lose a few here and there and then it's unplayable. 2) also worried that it will crush the puzzle cards. Spring. Written for >3 years anyway, so I can't complain. :)Very satisfied.