Author: Raven
Gametype: CTF
Size: 8 - 16 players
Background: This came in the .zip file that contain a bundle of .map file source released by Raven. Initially, the map had many holes and bugs which led to be dysfunctional. I've seen over the years some other source maps being restored (like jpndm1 and an older version of sibctb1) but none seems to have done with kosctf1 yet to my knowledge.
Setup: Place the pak file to your base folder.
Spoiler:
Trivia: The red side is built on the same construct seen in kosctb1.