The Defender Duel has a competitive play pattern: The radio-controlled Defender vehicles enter the arena, facing the spectators in the stands — all constructed of Rokenbok's unique girder, ramp and decking units. Then it's no-holds-barred excitement as the two players try to capture all three flags from their opponent's vehicle or push the vehicle completely out of the arena to win the game. Like the other Rokenbok Start Sets, Defender Duel includes the four-player, eight-vehicle command deck and eight receiver keys, which allow nearly limitless expansion of the system. “Retailers responded enthusiastically because of the proven themes of these new Start Sets; Rokenbok's reputation for imaginative play; the flexible expandability of the Rokenbok construction system; our full-featured, robotic vehicles, and the rock-solid quality of every Rokenbok product, backed by our lifetime warranty,” Christine Norris, marketing for Rokenbok Toys, told TDmonthly. “Men really like the Rokenbok sets and are always adding to them,” said Ed Dodd, manager of Classic Toys in Anchorage, Alaska.