Where do i find play co arm boy?

Please provide more context. What is "Play Co Arm Boy"?

* Is it a specific game? If so, what platform is it on (e.g., PC, mobile, console)?

* Is it a specific type of game? For example, is it a fighting game, a puzzle game, or a role-playing game?

* Is it a specific character or item in a game? If so, what game is it from?

Once you provide more information, I can help you find it.