IO Blocks(R) - 500 Piece Set

The 12 unique shapes click together with a satisfying snap, and my son spent a whole afternoon making robots before switching to a castle. The six colors are bright enough to keep his attention without feeling overwhelming.

My kids are 4 and 7 and they’ve built everything from a rocket ship to a crocodile with these—the 12 unique shapes really snap together tightly enough that their towers don’t topple mid-build. I love that it’s just plastic pieces and no magnets or batteries, so it’s quiet and they actually keep play

The six colors in this set make sorting and building fun, and the 12 unique shapes offer plenty of variety. My only minor gripe is the pieces don't always snap together as tightly as I'd like, but it's still great for open-ended play.