Zombie Panic! Source is a standalone cooperative, survival-horror, first-person-shooter! Set in the middle of a zombie apocalypse, players start as a small group of survivors attempting to stay alive. Each map will have its own objectives to complete and win the round or survive by a period of time.

headbite_alien says

10/10 - Agree (2) Disagree

It is technically a hardcore mod, dont let that put you off however, I can say without a doubt that this mod is the best similator for what it would be like in the zombie apocalypse. The game is generally well balanced but the surviors will probably only win about 20% of the time with sounds unfortunate, However they will kill pleanty of zombies :). this is one of the only mods ive played where you were allowed to play as zombie which is very fun and their is an unmistakable team element involved with the zombies. one thing that will put off most people sadly is the balancing, because people are allowed to play as a zombies the game trys to give them a helping hand wherever possible, for instance they are very fast faster then the survivors and they have a short spint ability. They also have imense health and can take out a survivor in 4 claws which is about 5 seconds. so that brings that game to its most important eliments barricading! their are many ways to barricade use thengs such as sofas and knock them in front of entrances or stick planks of would up to block doorways, its very exlhilerating to fend off a hoard in your own little fortress with you limited supplies and weapons. speaking of weapons dont boter with mealee as a survivor the zombos can quite literally rip you to shreads in large numbers, also you will rarely get your hands on a proper assault rifle or shotgun so the average surviro is dependant on barricades Youtube.com i would also recomend you check out this survival guide for any further tips. To finish up then this is a mod i find surpasses games like l4d in every way, understand thats my opinion and its perfectly reasonable if you dissagree. but the game has very full servers in general in fact it is the most popular mod ive seen and for good reason so download now and i hope you dont regret it