Deathmatch, sometimes specifically one in which every player is pitted against all the others.
Chaos; a chaotic situation lacking rules or control.
Open to anyone and with no or few rules.
Inconsiderate or unfair competition, where the competitors are willing to do just about anything to win.
An activity or situation which is congested with participants and which is hectic or tedious, especially in the context of a busy, modern urban lifestyle.
The busy, modern urban lifestyle itself, especially when seen as a competition for wealth or power.