It would be cool if there was a mix of infection and campaign. All players would start as their spartan or elite with an smg and a combat knife. About 10-15 seconds into the game 1 player would be sent back to the starting area as a flood and would use his/her whip arm to infect humans. The humans would be infected without dying and everyone has 1 life. Bullets and knives could push zombies back but it should take 700,000,000,000 shots from an smg to kill a zombie. There should be goals to activate certain things(such as when a player reaches a goal a message appears on the screen saying door opens in 20 seconds then it does, mine cart leaving in 45 seconds then it does, or pelican arriving 70 seconds then it does. There should be no time limit and it should be called pandemic run. Zombies also went 3.5 times faster than humans and it would take 1 hit to infect a human (but they would have be within a 3ft radius to infect).