People say "play innocent" or "play dead" to mean "pretend to be innocent" or "pretend to be dead" respectively.
Can we apply that way of saying to the adjective "nice"?
Does "play nice" mean "pretend to be nice"?
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'Play nice' is an idiom. It means to not cause trouble; to play without arguing; share your toys.
It's a common expression for a parent to children who are squabbling.
As noted in comments - if this is said to adults, it often implies they are being childish.
I suppose strictly, it perhaps ought to be 'play nicely' but no-one ever really says that.