Indoor Activity Mystery Bag! NEW indoor activity mystery bag with proprietary sand compound to build amazingly detailed castles quickly. Includes one mystery part of the castle in the resealable bag! No mess, does not dry out with included storage bag, holds shape and offers limitless creativity. Based on our award winning 2020 Toy Of The Year outdoor technology, we are excited to bring outdoor play indoor! Become a skilled sculptor in no time with mind blowing details that our molds will reveal. Play for minutes or hours from the comfort of your home! When you are finished, included resealable bag will prevent compound from drying out! Build a single part or multiples, it's entirely up to you! Watch video tutorials for tips how to mold and sculpt using our proprietary sand for the perfect castle. Build, Smash and Repeat over and over! Collect all 6!