You will need to download the game here: http://store.steampowered.com/app/291550/
Brawlhalla is an epic platform fighter for up to 8 players online or locally. And it's free. Join casual free-for-alls, queue for ranked matches, or make a custom room with you friends. Millions of players. Frequent updates. Over twenty-five unique legends. Come fight for glory in the halls of Valhalla!
You may need to download it, but we are giving you a day to do so. It is only 200 MB, which is quite small.