IGN:Survivor Mode is effectively the RE 6 version of death match. You can play in teams or free-for-all, but you're basically trying to kill your opponents. The catch is what happens when you die. When you're killed, you respawn as a zombie, and can still attack the opposition (much like some variations of dodgeball, which Capcom told me was an inspiration for this design). If you manage to kill a human in zombie (or J'avo) form, you'll be granted a second chance, and will re-enter the battle as your original character.