SOG has its own single player storyline. It consists of 9 brand new maps (named SOG1 through SOG9) and shows lots of new monsters. You can start the storyline by pressing the "Play SOG story" button in the launcher.
To install:
Extract all files to Quake 2 directory and use shortcut to enable the game "console"
It's also possible to go through the original Quake II missions again, but this time playing as Blaze, Flynn or Axe ! It's also possible to convert the Quake II missions to a new style by setting the SOG_IDG1_ONLY, SOG_IDG2_ONLY or SOG_IDG3_ONLY sogflags.
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This version is broken and unplayable. Get 1.3 on Gamepressure or somewhere instead.