On Thursday, Valve Software surprise-launched a comprehensive update to its five-year-old game Counter-Strike: Global Offensive (CS:GO) with two equally major changes: a new battle royale-inspired combat mode and a shift to the free-to-play economic model.

The battle royale mode in question, dubbed “Danger Zone,” resembles popular fare like PUBG and Fortnite in that it revolves around a similar formula. Players drop onto an island with very little equipment, then search for weapons, ammo, and gear while trying to be the last person surviving. In order to speed combat up, a constantly shrinking “safe zone” forces players to run towards each other.