i Register
In some senses, free-for-all is marked as idiomatic. Watch for register when choosing this word.
ADJ.
competitive, developed, turned
VERB + FREE-FOR-ALL
become, becomes, cannot, ended, festooned, time-honored
FREE-FOR-ALL + NOUN
anything, company, fists, front, hellscape, shinomiya
PREP.
in, in, into, with, with