Chaos; a chaotic situation lacking rules or control.
Deathmatch, sometimes specifically one in which every player is pitted against all the others.
Open to anyone and with no or few rules.
A contortion of the body in an attempt to escape or to perform a difficult task.
Strife, contention, great effort.
To strive, to labour in difficulty, to fight (for or against), to contend.
To strive, or to make efforts, with a twisting, or with contortions of the body.