Brawlhalla is a free-to-play fighting game developed by Blue Mammoth Games for Microsoft Windows, macOS, PlayStation 4, Xbox One and Nintendo Switch. The game was shown at PAX East in April 2014, and went into alpha later that month.An open beta became available in November 2015, followed by the game's release in October 2017.
On March 5, 2018, Brawlhalla developer-publisher Blue Mammoth Games was acquired by video game publisher Ubisoft, and as a result of this, Rayman joined as a guest fighter on November 6, 2018, the day the game was released for Nintendo Switch and Xbox One.
On July 6, 2018, Ars Technica released an article detailing precise player counts for Steam games obtained through a leak as a result of a "hole" in its API. This leak showed Brawlhalla to be ranked 24th in player count on Steam with a total of 8,646,824 players, out of all games featuring the Steam Achievements system.