What's next?

Max is really into puzzles right now. We've slowly been buying them, mostly the wooden chunky puzzles that didnt mimic the actual puzzle piece shape. On Friday night Daryl picked up a real puzzle at Target for $1 (24 pieces) and he's already got it mastered. He'll do it three times in a row. He loves these things! What's next for a 2.5 year old? I guess we'll have to move up to a 50 piece puzzle.
The barn puzzle was first, a good challenge, but he figured it out quickly. The auto puzzle is acutal puzzle piece shapes, again, a good challenge, but he's bored with it. The U.S. puzzle is the one Daryl bought, he's mastered it already.