Rocket League Blasts Over to Epic Games in Free-to-Play Move, Sept. 23rd with Crossplay
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Rocket League is going free to play on September 23rd, only on Epic games. At that time the game will no longer be available for purchase or download from Steam, unless previously purchased.
Cross-platform support will be available for Epic Games and Steam players.

About the Game
A futuristic Sports-Action game, Rocket League, equips players with booster-rigged vehicles that can be crashed into balls for incredible goals or epic saves across multiple, highly-detailed arenas. Using an advanced physics system to simulate realistic interactions, Rocket League relies on mass and momentum to give players a complete sense of intuitive control in this unbelievable, high-octane re-imagining of association football.

https://www.rocketleague.com/news/rocket-league-free-to-play-arrives-september-23/