In teresting enough to be challenging for our 2 1/2 year old, but still he is able to proudly complete the puzzles. I love the coding on the back with shapes that makes it easy to keep the 4 puzzles separate.
Standard toddler puzzles: the peg puzzles fit great. The blocky (no knobs or pegs that have pieces that could be incorporated into other play; ex: animals and cars) puzzles fit, but awkwardly. The pieces are at the edges and get popped out by the wire or just don't slide in all the way. We have one chunky knob puzzle (cars and the base is an octogon) lives in the top slot
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