Lego Castle Exclusive Limited Edition Set #7041 Troll Battle Wheel Formerly a retailer exclusive! For ages 7-14. 508 pieces! The Troll Battle Wheel rolls, shoots and crushes everything in its way! The knights of LEGO Castle have never faced anything like the gigantic troll battle wheel and its hidden rapid-fire cannon. Can the knights' catapult and barricade trap stop it, or will the trolls roll and smash their way to victory?