Zombie Survival: (good if your short on guns): Teams: more zombies than humans. humans have 1 gun each.
Materials needed: At least 1 airsoft gun(loaded), some kind of way to signal whether you are a zombie or human. etc.*
How to play: Always have more zombies than humans. Humans have the gun(s), and zombies have nothing. Zombies can get a head start to hide. Zombies need to wear the infected symbol (shirt off, hat on, wearing zombie mask, etc.). If a zombie touches a human, the human drops his gun, (careful with this. if its dark out somebody could step on the gun, so if you wanna play safe, maybe have a 'dropped gun' tables set up somewhere), and the human puts on his infected sign. Zombies die when shot anywhere, and they go to a dead zone. If all the survivors become infected, the original zombies win. If all the zombies die, the survivors win.
*suggested: glow in the dark BBs if playing at night (just for awesome effect), and you can add any items you want, like possibly a medicine to heal 1 infected survivor back to human-ness.
Yes this game can be unfair. and it can be completely fair. it depends on what kind of yard you play on. my friend has a huge yard with a bunch of hiding places, plus we can play all around the neighbourhood, so its a really good game at his house.