This is a free-to-play online game originally released only on mobile devices that later received a Steam port. It takes place in the X
series and focuses mostly on that series, but it does also include playable characters from the other Mega Man
series games as well. The goal of the game seems to be to build up your characters; you can earn new ones by “rolling” on them or sometimes by earning them via various special events.
I will probably someday be able to play this, so I am likely to expand upon this page in the future. However, I doubt I’d be able to give an online game extensive coverage since such games change so frequently, so I’ll aim for more of an overview.