I loved quake2!
The map indeed was q2dm1 'The edge'. The rail gun was in the room under the water.
How do you play this game now? What does it play like- I remember this making me invest in more ram and my first 3dfx card for the first time. P166 and 16mb of ram lol.
There was an online game called Red rover that was excellent. Also loved the servers that had power ups Haste, Vampire and some others.
Super shotgun, quad damage and haste was the most hilarious combination.