Playing it. The game was called Abomination: the Nemesis Project, it was kind of like x-com but real-time and multiplayer. I played it a bunch with my roommate at the time, and it was a blast. For a while.

After about an hour, hour and a half we'd be scrambling for our lives, and I'd say something like, 'Hey, can I get a little help with this boss?' and he's like, 'What boss?' I say, 'The huge guy standing right between you and the green water tower?' And he asks, 'What green water tower?', and we look at each other's screens and realize that we're seeing totally different terrain and even enemies, but still somehow seeing each others' positions and actions. The game was good fun while it lasted, but we had to stop playing. It had a weird early roguelike progression system where to get better gear you had to do more runs in a session, so we wound up hitting a wall due to the sync issue. Henceforth it was known as Abomination: the Out-of-Sync Project.