Puzzles have been a favorite activity of our son's for a long time and at Christmas he was gifted with these "My First Puzzles" by Dorling Kindersely (one of my favorite publishers!). They are his first experience with jigsaw puzzles and he works on them almost everyday. The puzzles get progressively harder: the ducklings are three pieces, the puppy is six, and the tiger is nine. He master the ducklings immediately but today was the first time I saw him assemble the puppy and tiger cub with no assistance other than encouragement!
I'm going to keep my eyes open for more of these!