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The KINGDOM HEARTS games are finally coming to Steam in June
(www.gamingonlinux.com)
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Why does it matter?
The platform isn’t changing, still Windows only
If we're lucky, Steamdeck verified will also mean it'll run fine on linux.
Still Windows only
It’s not like you can’t use proton/wine with Epic
With a quick Google search it already does with the Epic version, though it's maybe a little janky (which I expect to remain). Valve created Proton, but you can use it outside of Steam.