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

Overview

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

Challenge

• South Korea: 29 September 2016.

Boss Battle

• South Korea: 20 October 2016.

Gallery

Official poster