Get creative with PicassoTiles Fortress Construction Building Kit (SKU: PTC150) Featuring an easy-to-use latch-clicking system, this set includes 50 colorful geometric joints, 84 secure connecting sticks with a new locking mechanism, and 16 stability-enhancing cross tubes. With 18 snapping holes per joint, kids can build forts in endless shapes and sizes, making every play session an exciting adventure in engineering and imagination.