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Bigger version with Gun & Yellow version:
Day of the Tentacle, also known as Maniac Mansion II is a 1993 epic graphic adventure game developed and published by LucasArts.
Purple Tentacle, one of the crazy Dr. Fred's creations, drinks contaminated water from Dr. Fred's Sludge-o-matic. He mutates into an insane genius and grows arms, and now he's plotting to take over the world.