Mega Man Legacy Collection is an emulated compilation of the first 6 Mega Man games developed by Digital Eclipse. The game also features many sketches, pieces of artwork and data on the Mega Man franchise.
There are at least 50 challenges where Mega Man does certain tasks as fast as he can and does a different challenge not necessarily in the same game a la NES Remix. These challenges are
Using either the Mega Manamiibo or the Gold Mega Man amiibo will unlock 11 exclusive challenges for the 3DS. These challenges were created by fans.