In the 18 years since Minh Le and Jess Cliffe released the Half-Life mod they dubbed ‘Counter-Strike’, the series has fuelled a competitive gaming revolution and grown into a bona-fide global phenomenon.    

As well as testing your current-season CS:GO knowledge, our latest quiz features some fiendish brain-teasers on the history of the franchise. Can you dominate the competition as we step the difficulty up to Level 2?