Knockout City is going free to play - Polygon

In a blog post promoting the game’s upcoming Season 5 of online content, Velan Studios announced that its cooperative dodgeball multiplayer title Knockout City will be going free to play beginning this Spring.

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Knockout City has officially gone free-to-play

Knockout City Is Officially Free-To-Play, Season 6 Now Live - Game

Knockout City is now free to play until you reach level 25 - The Verge

If you slept on Knockout City, don't skip its free relaunch

Knockout City is going free to play - Polygon