Change Title Screen
When you beat any boss in new mode with only the mega buster and load the game with the boss as your character, you will receive a new title screen showing that boss and him saying "Megaman Powered Up".
Play as Blues/Protoman
To play as Blues/Protoman you must complete all 100 of the games challenges.
Unlock Charge Shot/Sliding
Beat every stage on normal.
Unlock Robot Masters
To unlock a Robot Master as a playable character, you must defeat them in new-style mode using only the Mega/Rock Buster.
Play as Rock - unarmed Rockman/Megaman
Beat the game on Hard Mode to obtain Rock - Rockman/Megaman unarmed. His attack is the Rock Kick.
Play as Robot Masters
To unlock a Robot Master as a playable character, you must defeat them in new-style mode using only the Mega/Rock Buster.
Play as Bosses
To unlock a Robot Master as a playable character, you must defeat them in new-style mode using only the Mega/Rock Buster.
Unlock Rockman S
Complete Easy mode on New Style to get Rockman S.
Unlock Roll
Download from Capcom's Website.
Unlock Megaman C
Beat Normal Mode in New Style.