Select the "Continue Search" option at the title screen. Seven spheres will appear. Enter ZPF*M86 as a password to reach Bowser, the final Boss. To view the ending sequence, the Boss' head six times. Leave through the door that the Boss used to enter, then find and free Mario to complete the game.
Roy battle
Enter JPF13HT as a password to advance to face Roy, the last Koopa. Hit him six times to reach Bowser.
