Using the Rock 'n' Gem Surprise is super easy. First, grab the play hammer and chisel included in the set. Then, use them to crack open the reusable play geodes. Inside, you'll find the colorful and uniquely shaped plastic gemstones. You can use these gems for sorting by color or shape, matching similar ones, and counting how many you have. When you're done playing, simply pop the two - piece play geodes back together. To keep the set in good condition, store the geodes and gemstones in the provided storage bag. Make sure to keep the play hammer and chisel away from small children who might choke on them. Also, avoid dropping the play hammer too hard on hard surfaces to prevent damage to the hammer or the floor.