The fourth stage, the Ice Cavern, is a platform level where the player has to use snowballs and ice blocks to destroy barriers while dodging those cold elements as well as spikes and hedgehogs and facing snowball-throwing snowmen. Level six, Karnath's Lair, is a set of rooms that each consist of only one exit and multiple snakes moving in varied, twisting rectangular patterns that serve as platforms, and the toads must traverse them while also dodging spikes. Intruder Excluder, the vertical-scrolling eighth stage, is the most platform-oriented level in "Battletoads"; it involves several jumps on platforms, springs and through electric barriers between moving gaps of platforms, avoiding obstacles such as rolling Big Balls, Snotballs, suction valves named Suckas and poisonous gas guns named Gassers, and its only beat 'em up sections being encounters with Sentry-Drones, The player must get from the bottom to the top of the level, where a boss fight with the Queen's genetically-modified biogen Robo-Manus takes place. Level nine, Terra Tubes, is a mixture of a platform and underwater stage, and the only instance of the toads swimming in the game; it involves the player going through a non-linear pipe entrance into the Gargantua, with sections including encounters with Mechno-Droids and Steel-Beck duck creatures that guard the tubes, chases from the Krazy Kog, and rivers infested with spikes, sharks, electric eels named Elctra-Eels, and instant-attacking Hammerfish.