Race against time/Zombie escape. Map is a mall/airport or any large building, with 3-4 different routes, start at one end and be first to the chopper in the parking lot to win. As time goes by zombies break into the mall starting from where you spawned, chasing you. Every 30 seconds to a minute zombies break into a different part of the map making the escape more challenging. The All the while there are semi hidden items for sabotaging the other players. Things like hallucinogenic syringes and flash grenades to regular grenades and other throwable items.
The zombie spawn should be random each round, other than the ones that spawn in the starting point to get rid of afks.