Wall Street Journal reports . Psyonix spent less than $2 million over a span of two years on the game's development.

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Studio founder and chief Dave Hagewood said the team built Rocket League while taking on contract work from major developers. "We paid the bills by working on some of the biggest games in the industry;" games like EA's Mass Effect 3 and Microsoft's Gears of War.Hagewood's strategy for promoting the game was to get it into as many hands as possible. Rocket League was available to PlayStation Plus subscribers for free for a month, and the game spread rapidly via word of mouth.Since then, the game has had continuous success, boasting over 8 million players . Psyonix also partnered with Universal Studios to bring Back to the Future DLC to Rocket League "It didn’t really sink in until they told me they had to get Steven Spielberg’s approval," Hagewood told Wall Street Journal.Rocket League's Winter Games are going on now , allowing players access to a hockey-style variant of the game. The arena-based car soccer game is coming to Xbox One in February.

Nicole is a freelance writer for IGN. You can follow her on Twitter