Counter-Strike series

There are 4 games categorized as theCounter-Strike series:

• Counter-Strike
• Counter-Strike: Condition Zero
• Counter-Strike: Source
• Counter-Strike: Global Offensive

Counter-Strike Online,Counter-Strike Online 2 andCounter-Strike Nexon: Zombies are categorized as the spin-off games, developed byNexon of South Korea with the oversight license fromValve.