CoM: Nazi Zombies - Exploits to get past early doors.

The starting gates are very easy to bypass without buying them. If you hop on the table and jump to the very edge of the railing, you can land on the other side of the door and continue on.

If you continue up the right side, the end portal frame allows you to jump over yet another doorway. Not sure if this was intentional, but the first doorways are very easy to bypass.