Round 29 solo, and I'm sure I was only lucky. I have also got to round 16 with 3 people. How'd I get to round 16? My uncle was playing and he stinks at it, so, he rage quits even though he's older than me. So, then I was stuck with a bunch of 25 year olds that are newbs at zombies, but, of course, brag themselves up. I had to babysit them for over 3 rounds because they kept getting down. My usuall rounds are between 15-30. Not great, more like average.