ragnarian

i think its been suggested a few times (cant remember by who) but imo tunnels, or underground passages, in the game would make it alot more frightening and intense, but more fun, places like castles usually have underground areas, same goes for large military instalations, and some large buildings too. having lots of zombies in a small, dark and tight space will be a challenge for many players, survivor numbers will mean little. what do you think