CS: GO will expand upon the team-based action gameplay that it pioneered when it was launched 12 years ago.

Arsenal Mode is based on the popular Counter-Strike: Source mod Gun Game. "Arsenal: Arms Race" and "Arsenal: Demolition" add eight new maps and expand on the classic Counter-Strike gameplay.

Valve is working directly with creators of Gun Game to create  Arsenal Mode. "We are excited that Valve reached out and is working with us to ensure Arsenal Mode is the best version of  Gun Game.", Michael Barr project lead of Gun Game.