To obtain a key for the PC beta, players must complete a survey on Valve's Steam platform.
Starting next week, Valve will select players to join the beta based on answers posted to the survey.
"There are no wrong answers to the survey questions," writes Valve on the Counter-Strike blog, adding however: "If you don't fill it out, you won't be getting a key.
"Over the coming months we will make selections from the survey participants. Sometimes we might add experienced players, other times new players. Sometimes 1.6 players, sometimes CSS players, sometimes people who have played neither."
The Counter-Strike: Global Offensive beta launched last week. Valve has already issued 7,000 keys to current Counter-Strike players, as well as 2,000 keys to various community sites.
The next iteration in the fan-favourite PC shooter will see cross-platform play between the PC, Mac and PlayStation 3 versions of the game.
Counter Strike: Global Offensive will feature seven classic maps, five for the Bomb/Defuse mode and the other two for Hostage Rescue, with each map receiving graphical upgrades while leaving level layouts intact.
A new Casual mode will allow new players to buy as many weapons as they please per round without worrying about cost, while voice-chat is open to all players on both teams, as well as spectators.
Counter-Strike: Global Offensive will release on PC, PS3 and Xbox 360 following the successful completion of its beta.
> Counter-Strike: Global Offensive interview - Valve on its latest game
> Counter-Strike: Global Offensive - Preview
Watch the Counter-Strike: Global Offensive trailer below: