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Batman, Punisher, Captain America, Daredevil ,Wolverine, Iron Man(regular armor) and Spiderman . They're instantly transfered to a replica of Manhattan with no people just villains and they have to defeat both them and each other who wins.
(NOTE: They have free range of the city)
villains
Venom
Joker
Sabertooth
Red Skull
Omega Red
Elektra
Prometheus (DC)
Lady Shiva
Dr. Doom (just armor & basic gadgets no prep)

I think the heroes win.

Iron man smashes on everyone.

Wait... wait... yes. Iron Man beats the crap out of all of them.

Heroes win.

And Spidey and Cap would have the best chance against Iron Man I think.

Hm...one of those three wins it.