I beat it in most of them. Planet Robobot, and Triple Deluxe are the two most recent. Also beat it in Return to Dreamland, Super Star, and probably some more that I'm forgetting.

[quote]I beat it in most of them. Planet Robobot, and Triple Deluxe are the two most recent. Also beat it in Return to Dreamland, Super Star, and probably some more that I'm forgetting.[/quote] I'm pretty sure that those 4 you mentioned are the only 4 with a True Arena.

I have. Though the setups I used made it only fairly difficult. I ran fighter on robobot and yo-yo on super star ultra.

As for me, I cleared Super Star Ultra's True Arena with stone and hammer, while I beat Planet Robobot's with ESP.