(adsbygoogle = window.adsbygoogle || []).push({});It's a pretty useful glitch for the first few rounds.
1. After you get enough money, open the sliding gate. Do NOT open the stairs.
2. Fight off the zombies until dogs arrive.
3. When dog round starts, go to the first wall perpendicular to the wall holding the Thompson.
4.Then get under the stairs(which is not supposed to be open)
5.Then go in the corner hugging the wall and you're done.
I'm not sure if it's for co-op though. Sorry I do not have a capture card. Anyways, the dogs should not touch you as they are only hitting the wall. Enjoy!