A very cool toy, it allows for hours of entertainment, building, and just plain tactile fun. Every adult who has come over while my kids (2, 4, 8) have played with it, loves to join in because it just feels so cool, a little like clay, a little like sand--like waxy sand. You won't be disappointed! You can buy colored packs of sand to add to the basic kit. More often than not, hands are the best tools for building volcanos and burying Lego guys!