Rocket League is a high-powered hybrid of arcade-style soccer and vehicular mayhem with easy-to-understand controls and fluid, physics-driven competition. Rocket League includes casual and competitive Online Matches, a fully-featured offline Season Mode, special “Mutators” that let you change the rules entirely, hockey and basketball-inspired Extra Modes, and more than 500 trillion possible cosmetic customization combinations.
Rocket League is on Steam. When the eventual Tavern store launches, you'll be able to buy it through Tavern with full transparency about the +$0.05 convenience markup — but the actual transaction will still happen on Steam, and the game lands in both your Tavern library and your Steam library.