Same as for the main part of the game - no active skills, all passives maximized.
You may notice, it's a lot harder, since passives were balanced better for this part.
Enjoy! ^^
That would be me completing this game's arcade mode without using any active skills.
On one hand it's a gaming challenge, on the other - it's a stripping game after all :)
Enjoy! ^^
One small note - this done with DLC installed and all passives maximized - so I had ~x1.5 attack power, than i would have without DLC.