Thanks for those, I played these with my co-op friend. The white map was way too hard for the bald guy character, the dash attack didn't kill the enemies with one hit, so he got downed all the time.
But black worked really well, it's good that the money is added together with your co-op partner, so you both get around 35k gold in 15 minutes.
100k - 24.8.2011 | 200k - 2.12.2012 | 300k - 1.12.2013 | 400k - 24.3.2015
Shooter gamerscore with XBA calculations: +160,000