I fight this character called Ao Oni. He's from the RPG survival horror game. When he touches you, you're done for. To beat him, it has something to do with long range attacks or something. I didn't F1 on him, he dies automatically.
Stage: Super Mario Bros. (Castle) BGM: Super Mario Bros. - Castle Stage
Starring: NES Mario by Basara-Kun Ao Oni by iiotoko
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Ao Oni is a purple demon from a Japanese survival horror puzzle RPG but his name means blue...