Indie success Rocket League has raked in more than $50m since it launched in July. The main key for this game to make that much was to release it for free on Playstation 4. It’s also available on PC and is coming to Xbox One in February. Rocket League also cost $2 million to make. Developer Pysonix has said that its decision to release Rocket League for free to PlayStation Plus subscribers was the key to its success, and drove further sales among PS4 owners who weren’t Plus owners and for those who played and enjoyed the game, cosmetic DLC such as the Back to the Future DeLorean pack was available for a small extra fee.








