free-for-all
Pronunciation:
/ˈfɹiːfəɹɔːl//ˈfɹiːfɚɔːl/noun
Definitions
Chaos; a chaotic situation lacking rules or control.
Example: When the fire alarm went off, it was a free-for-all.
Deathmatch, sometimes specifically one in which every player is pitted against all the others.