Luigi's Mansion

In-game reset
Hold B + X press Start for about two seconds during game play.

Teleport to main entrance
This trick requires a Game Boy Advance. Look at most large mirrors in the house. On the Game Boy Advance, press A while facing the mirror in the first person view to return to the main entrance.

New mansion
Successfully complete the game and save. Another option will be unlocked, allowing the game to be played again with various differences.

Gallery mode
Successfully complete the game to unlock everything in the gallery