The very clever puzzle game Superliminal, where everything is about your perspective now has multiplayer was a "Battle Royale" mode where you're all a Chess piece. It's a little weird but it also looks like plenty of fun.
Superliminal is a first-person puzzle game that uses perception as a mechanic. You play as someone who wakes up in a surprisingly lucid dream. You complete puzzles to reach each exit, while looking around to grab objects and change them based on how you're looking at them. It's all about thinking outside the box. What you see is what you get. Literally.
What's said to be only available for a limited time, so it may vanish after the holiday season coming up, this new mode is pretty surreal. Up to 12 players battle against each other through a series of randomly generated rooms full of surreal obstacles in a race to the end, under the watchful eye of the Standard Orientation Protocol.
Currently, it seems the multiplayer mode isn't in the native Linux build, so you may need to use Steam Play Proton. Update - the developer said:
You can buy it for Linux on Steam.