Pile it on until there's a…Meltdown! Atop the tower you'll place the squishy goop—roll it, smash it, just place it however you want. And then set the balancing platform on top of that! Take turns stacking cool, slippery cubes you have to stack on top…but be careful…between the goop and slippery platform, it's always shifting! If there's a MELTDOWN and any cubes fall, you have to take them, and that's dangerous because the goal is to get RID of your cubes! No batteries required. For 2 or more players.