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Regular Show Nightmare Athon is one of many Action Games to play online on your web browser for free at KBH Games. Tagged as Action Games, Nightmare Games, Regular Games, and Show Games. Upvoted by 59 players. Other games you might like are Nightmare Drive and Nightmare Before Christmas: The Pumpkin King. No download or installation needed to play this free game. Hope this game brings a little joy into your daily life.