[quote name='KaneRobot']The standard Mega Man games are unlocked (1-6 from NES era, 7 from SNES era, and 8 from Saturn/PS1 era). Besides this, there are two arcade games that are unlockable. It's sort of "Street Fighter with Mega Man characters." The first one is unlocked after you beat the first four MM games, the second I assume is unlocked after you beat the remaining four (I'm almost done with 7 and haven't started on 8 yet).
There are a bunch of other unlockable things too like remixes from the games, a G4 "Icons" episode on the MM creator, and an episode of the MM cartoon.
Leave.[/QUOTE]
Nope, unlocking the arcade games is even easier than that. Beat Spikeman in MM3 to get the first arcade game, and Junkman in MM7.