
Simply put it's a continuous onslaught of goons they get stronger the longer you survive and try not to let any pass you (3 and your done) or get hit by a sniper or RPG, at least that's what I've been able to glean so far.
Okay it's a bit of fun, the weapon is a bit under powered (but that's to make you pay up) well actually it's pants, and you can upgrade after scoring enough but what I got for one round it's going to take quite a few before I can do even 1 upgrade and there's lots of them to do.
There's a leader board and after 3 rounds I'm at 410 with 13500, but there are some with well over 250k, this quick really...
I managed to get an extra 600 for a 'frenzy' whatever that is as usual no (well very little) information on any part of it.
Not sure if this will last long or whether it'll get wrecked before that or even just be taken away from the grunts and only be available to those prepared to pay for it, like the forge.