[dustin999]

Dumb question, but which CTF game/mod are you referring to?

[endgame]

He isn't. It's a term to describe security competitions: https://en.wikipedia.org/wiki/Capture_the_flag#Computer_secu...

[ibrahima]

Presumably they're talking about security, not an FPS mod: https://ctftime.org/ctf-wtf/

[xanderstrike]

It's a gamification of security analysis. Teams are pitted against one another trying to exploit a system to achieve a goal.