I introduced my 3yo to jigsaw puzzles when she was 2 I guess, we started with 2 pieces (alphabets and images) and then 3, then 10. Now she can do up to 30 pieces on her own. I wanted to try out the 100 pieces with her and she was very overwhelmed. Best way to get her interested in the 100 pieces one is to do it with her. That seemed to work. :)