Ingranaggi Giganti Polydron

My kids love fitting the triangles and squares together, and the gears actually stay in place when they crank them. It's sturdy enough for our daycare center, and I've seen them problem-solve for half an hour straight trying to make the whole thing spin.

We bought these for our son's fourth birthday, and the gears actually spin smoothly when you connect them to the triangular base pieces. He's been figuring out how to make the whole row turn at once, which feels like real problem-solving play.

My three-year-old is obsessed with snapping the squares and triangles together, and the gears click in so easily that she figured them out on her own. It's rare to find a toy that actually teaches basic engineering at this age, but I've seen her problem-solve when a gear won't turn, and that alone i