Starkenstein Boss is the boss level of Castle Starkenstein in Frogger Advance: The Great Quest.
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This is where Frogger has to fight Dr. Starkenstein. Metal Chicken Ray is imprisoned in a cage and get released once you hit the first time Starkenstein. Metal Chicken will wander around in the bottom of the level and is indestructible, but can be frozen using the freezing stone ability. Use this freezing technique at Frogger's advantage, freeze him so you can reach easily the moving platforms above.