As someone who grew up playing the originals, it would be kind of nice to try this game and see what it's like. But it's not worth using something other than Linux to make that happen. Oh well.

For those unaware, the original Marathon games were in the same vein of 2.5D fps as the original Doom. It had a more foreboding sci fi atmosphere, and has been credited as one of the first fps games to actually weave narrative elements into the gameplay itself.

It's also freely available and open-source these days.