Leaderboards, challenges, replays: Challenge Mode takes moments from each title and weaves them into a series of, well, challenges! So things like 'can you do these six areas strung together with one life bar' or 'try fighting all six Mega Man 1 bosses in a row.' And to keep the quest for the best time alive, the top performers in each Challenge will have their replay data uploaded and viewable to everyone! There will be many challenges to vex seasoned players AND help train newcomers in the ways of the Blue Bomber.
Database: Each Mega Man game will have a database that includes enemy lists. From here you can read details about certain enemies and hop directly to them for a practice session. For example, say you're tired of playing all the way to Quick Man just to lose over and over. With the database, you can hop directly to him and practice that buster run until you get it down to a science. Then it's off to the full game for the real deal!
Museum: MMLC will sport an exhaustive collection of sketches, art and other visual materials that help put you in that 1987~1992 time period. Part of this game's goal is the preservation of history, and the folks at Digital Eclipse are scanning items at absurdly high resolutions to make them as clean and clear as possible.