counter-strike: global offensiveCounter-Strike: Global Offensive  was released August 21, 2012 by Valve. The game was developed by Valve. Counter-Strike: Global Offensive is a coop first person shooter.

Counter-Strike took the gaming industry by surprise when the unlikely MOD became the most played online PC action game in the world almost immediately after its release in August 1999,” said Doug Lombardi at Valve. “For the past 12 years, it has continued to be one of the most-played games in the world, headline competitive gaming tournaments and selling over 25 million units worldwide across the franchise. CS: GO promises to expand on CS’ award-winning gameplay and deliver it to gamers on the PC.

This game is rated to so that players of varying skill are grouped more fairly. This way it is not unplayable for the new guy who comes in when the game is on special.

Counter-Strike: Global Offensive features classic content, such as revamped versions of classic maps; as well as brand new maps, characters and game modes.

The game offers 5 different play modes:

  • Casual and Competitive
  • Defuse
  • Hostage
  • Arms Race
  • Demolition

Another game mode (Deathmatch) was added later.

In a sense this is a small multiplayer battle arena that ends with last man standing. There is a time element so survivors earn more bonuses. After each round the game resets and the player go at it again.

The game provides matchmaking and leaderboards for all online game modes using Steam provided servers.

The provided online service offers the ability to filter by game modes, maps and a built-in Steam friend system. Valve also employs Valve Anti-Cheat, which can automatically remove and ban players from the Valve online network. To match players of similar skill levels for an enjoyable experience, the game uses an Elo rating system.

The PC version of Global Offensive also supports private dedicated servers that the player may connect to through the community server menu in-game. These servers may be heavily modified and can be completely different from the base game.

Valve also enabled the Steam Workshop, which allows users to explore and download new maps and custom gameplay created by the Counter-Strike community. In previous versions of Counter-Strike, players had to download maps through third party sites or while attempting to connect to a server. This Workshop is controlled by Valve, and they reserve the right to remove content. Steam Workshop also allows users to discuss things that the community would like to use implemented in future maps. It also lets users follow Authors and see your friend’s favorites and their items that they created. Users can rate maps using a five-star system. Content can be created by using the CS:GO Authoring Tools/SDK.

As you play you earn money that you can then spend on weapons etc. You can also pick up weapons and add them to your inventory. If you are broke however, you will have to hide and lay low, looking for a surprise head shot to make a kill.

Even with a pistol you can grind out some money for new guns fairly quickly in

Here is a wiki with the ranks.