Good point. I guess I could have said first modem-based multiplayer 3D first-person shooter or something like that. Being able to play against friends across town was great.

I actually played multiplayer Maze War at the Living Computer Museum on a Xerox Alto in 2017: https://photos.app.goo.gl/VUVXQ1cG3zWAMWY3A Right is a real Alto and the other two are emulated. The three were running a multiplayer game.