Rocket League works just fine for me, via Proton. I have over 4k hours in, each one of them done from Linux.

BakkesMod also works, thanks to https://github.com/CrumblyLiquid/BakkesLinux

Rocket League has a platinum rating on ProtonDB: https://www.protondb.com/app/252950

Does that include multiplayer? As far as i know, multiplayer was killed a couple years ago, which is actually what i meant by “works on Linux”

Yeah I have hundreds of hours or more in Rocket League on Linux, all competitive multiplayer. I use the Heroic launcher: https://heroicgameslauncher.com/

YES! Use the Proton version, not the native Linux version.

Rocket League was native on Linux at one point.

Before Epic Games acquired it...

I was able to get a new install of Rocket League working recently using Heroic Launcher! https://heroicgameslauncher.com/

Does Rocket League no longer work with Proton? It used to work even better than both the native Linux and Windows versions for me back in the day. If not, what changed?

FWIW, Rocket League works just fine on Linux, but you need to set it to the Proton compatibility, not the native Linux client.

I too recall having issues with the anti-cheat last I tried (years ago at this point).

How did those issues get fixed? Did they abandon the anti cheat, or does the anti cheat now work under proton?

Rocket League never had issues with anti-cheat. I have been actively playing it since before they stopped shipping a native version.

What? They use Easy Anti Cheat, which is one of those nasty kernel level anti cheats. Even ignoring my personal experience with the issue, a kernel level anti cheat built for windows seems quite unlikely to not have any issues whatsoever on Linux...

Do you only play offline or something?

Rocket League literally has a platinum status on ProtonDB[0]. It works perfectly on Steam using Proton if you have it there, or Heroic[1] if you have it through EGL.

Rocket League has literally never been unable to run on GNU/Linux. The full game. Multiplayer, Steam workshop, everything.

I suspect you may be thinking of a different game honestly. Maybe League of Legends? I think they switched to an invasive anti cheat a few years ago that caused it to no longer work on GNU/Linux.

[0] https://www.protondb.com/app/252950

[1] https://heroicgameslauncher.com/

Perhaps there is an opportunity for an open source reimplementation like OpenMW or OpenRA?