Official Quakewiki Video - Quake - Q2 - Decrepit Solitude

Another corridor runner, this one is extremely linear. Honestly, I don't get the point of the Thunderbolt, as by the time you get it the only thing left to kill is a Knight. Also, with no Health in this level, it can be punishing if you don't shoot fast enough. Finally, due to blowing up everything in the large room with a Grenade Launcher (you have plenty of Rocket ammo to deal with anything you meet in this level), you didn't get to see the Spawn.