PicassoTiles 600pc Building Construction Toy Interlocking Chips

My 4-year-old figured out how to snap the chips together on her own within minutes, which surprised me since she usually needs help with blocks. The interlocking design holds tight enough that her little castles don't collapse when she bumps the table.

The 600 pieces are way more than we needed for one kid, so the whole family ends up building together on the living room floor. The chips interlock tightly enough that our towers don't collapse when the toddler bumps the table.

My son is three and can snap the chips together without any help, which surprised me since most building toys frustrate him. The interlocking design holds tight enough that his towers survive a toddler sister bumping the table. We've already burned through two afternoons with these.