Here's how it works:
It's just like Last Man Standing except everyone starts with 999 health and 500 shield. The twist is that you only have 1 life. When you die, you are OUT. The last person standing wins. Also, health packs heal you 50 and heal you until you get to 700. After that, you need Health Vials (10) and Super Health Packs (200) to max yourself out. Shields: reg (200) super (300).