Have you tried the online co-op? It's ****ing awesome. I joined some rando who was trying Arcade mode on Hardest difficulty, and we actually made it kinda sorta pretty far before we got curb stomped.
Oh, and I don't know if you've already heard about this, but have you noticed those destructible arcade cabinets that randomly pop up? If you hit them with those stunguns the cops drop, you can teleport to some secret boss battles.
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