Mostly just to show the rewards from this, since I'm not sure anyone's bothered with anything but word of mouth. Likely could do the same on Standard(easy to abuse area effect weapons when there's no friendly fire), Intense would require some other players or effort on my end.... :P Too much trouble. Extreme and Insane, less feasible to go past Wave 10. Doesn't seem any point to keep going as well, even if you didn't already have the rewards.
Rewards: Air Machine Gun emote (Wave 10), Enhanced Reach 2 perk (Wave 20)
I'm pretty sure Enhanced Reach 2 drops randomly from campaign as well.
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