When in the game, press ~ to enable the console, then enter R[episode number]M[map number] and press Enter. Thus you will able to unlock levels. You can also unlock the last level by entering R2M8 as a code.
... tested with the official mission packs "Scourge of Armageddon" and "Dissolution of Eternity". To play the mission packs, copy "hipnotic" or "rogue" folder from the original mission pack cd to the "quake1" directory and use command ...
There have been two official expansion packs for Quake: * Quake Mission Pack 1: Scourge Of Armagon * Quake Mission Pack 2: Dissolution Of Eternity =BOTH ARE INCLUDED IN THIS RELEASE= Soundtrack This is based on the PC version of the ...