Street Fighter x Mega Man is available now for free on PC. The servers are currently slow due to the rush of people wanting the game, but if you have some patience you should be able to get hold of a copy eventually.
The 33.8 MB game sees Mega Man go up against eight Street Fighter legends, including Ryu, Blanka and Chun-Li across. Eight stages are also included in the game.
If you are keen to get started then you can download Street Fighter X Mega Man here.