Mario is Missing!

Cheat mode:
Press L + R + Start + Select on controller two when the "Search for Mario" and "Continue Search" text appears at the title screen. A secret menu will appear. You can now select the Castle, show loot, and start a sound test.

Bowser battle:
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.

Photo album:
After bringing the items back, walk in the open door where it first says "Closed" to get a picture of the monument. Collect all of it to get a bonus at the end.