PicassoTiles 4 Piece Blue Right Triangle Magnetic Tiles

I grabbed these blue triangles to round out the square set we already had, and now my kid builds actual pyramids instead of flat blobs. The magnets hold tight enough that the 3" pieces don't slide apart when he stacks them.

These four right triangles snapped right onto the square tiles we already had, and my son immediately turned them into roof peaks for his castle. The magnets are strong enough that the 3" pieces don't slide off when he builds sideways. Wish the pack came with more than four, because we keep running

Tossed a couple of these into our existing stash to round out some roof shapes, and the 3" size locks in just right with the rest of the tiles. They're sturdy and the magnetic pull is strong, so the corners don't sag on taller builds. Kids went straight for them.