A legal copy of the PC Unity game you wish to play. The Setup Process: Install both the Base App and the Unity Plugin.
The link was shared—a password-protected Patreon post titled Project: Singularity joiplay unity plugin exclusive
If you're looking to game on the go, stick to these officially supported engine plugins available on the JoiPlay Patreon : RPG Maker Plugin (XP, VX, VX Ace, MV, MZ) Ren’Py Plugin (Visual Novels) Godot Plugin (New/Experimental!) A legal copy of the PC Unity game you wish to play