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Luigi's Mansion

The mice can only be caught before the lights come on in any room. So get the mouse and then the ghosts. If you miss the cheeses the first time around; after the third boss when the lightning trips the power and the mansion is in darkness again, go mouse hunting, although in some rooms now there are loads of ghosts, so it's not so easy as it was first time round.
In-game reset:
Hold B + X and press Start while playing.
Unlock Another Mansion and gallery mode:
Finish the game and save.
Shortcut to the main/lobby of the mansion:
Switch to your Game Boy Horror's first person mode and examine any mirror in the mansion with A. After a really trippy warp sequence, you will find yourself in the entrance hall of Luigi's Mansion.

Heart:
If you run low on power, run to the first level bosses room. (after beating him of course) and there will always be a 50 pt heart in the chest next to the door. If your under 50 hit points left. Exit room and go to main foyer and return to room and repeat. Sometimes it's out of the way...but it will keep you from dying.

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