Dream big & build big - no limitations, scalable to build as big as desired. Picasso Tiles in colossal styles. The 60 piece glow in the dark tile set can be assembled either as a stand-alone magnet tile set or in conjunction with other Picasso Tiles magnetic tile sets. Bonding by playing - entertaining for single or multiple parties. Feel the sense of achievement together. Suitable for all ages 3 and up. A great way to spend family time is by playing. Picasso Tiles magnetic tile sets are made for toddler pretend play, educational purposes, and more. Easy to construct and put away for storage. Features: For optimal glow results, you may charge this product directly under the sunlight for 2-3 hours. The glow-in-the-dark feature will last longer if you do not expose this product to intense heat or direct sunlight for longer than 3 hours.