A set of 6 irregularly shaped angular blocks that stacks in an unstable fashion. Players take turns building structures from the blocks under time pressure from a sand timer. Points are awarded for including many blocks, stacking two blocks on one block, and placing larger rocks atop smaller rocks. Multiple sets can be combined to create larger structures. The boxed edition under the title "ToppleRocks Challenge" includes a timer, scoring rules, and is packaged as a game for 2+ players. The bagged edition under the title "ToppleRocks" does not include scoring rules or a timer and advertises itself as a building toy. The blocks are manufactured from scrap wood, so the materials and coloration varies from set to set.