MARVEL Tōkon: Fighting Souls has an Open Beta available and sadly they seem to have blocked SteamOS / Linux from playing due to anti-cheat.

I somewhat expected this, because it’s a Sony game that was likely to use PSN, but this means Marvel Tokon is now on a very short list of fighting games that don’t work on Linux, including 2XKO and the online mode of Dragon Ball FighterZ.