Mode endless wave

Challenge is a type of mode in Counter-Strike Online 2.


In this mode, zombie spawns endlessly and the player has to survive until time runs out. In later update, another sub-mode called as 'Boss Battle' is added where boss zombies appeared as well.

Release date

  • South Korea: 29 September 2016.
Boss Battle
  • South Korea: 20 October 2016.


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