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I would have to say this was one of the harder bosses, but he is quite easy after you have gotten used to him. First what you need to do is wait for him to slow down (when he is bouncing), while your waiting locate the unicorns that are mde form ice on the left and right sides of the battle field. When he slows down suck him up and take him to one of the sides near the unicorn. When he pops use the ice power to freeze the boos, when they are frozen suck them up and Boolossus will get smaller. Repeat this to kill him. Every boo counts as one on your counter.

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Collect as much money and pearls as possible. The more you collect, the bigger the hearts will get. They can almost restore as much health as the large hearts do.

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Go into Mr. Lugg's room. Go to the left and there will be a door. Go through the door. Shake the refrigerator by pressing [A]x2. You will lose 4% life. A ghost will appear, and if it has a crystal ball in it, shoot out fire. The ball will soon disappear. Aim your light at it and vacuum it up. Vacuum the running sink and a blue coin will appear. Get the coin.

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Use your vacuum to clean all lamps, chandeliers, and vases. Most of them will contain either hearts (life) and money.

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You can find coins in almost everywhere; in halls, bathrooms, and many more places. When you find coins try to vacuum them up before they disappear. Bills will sometimes also pop up. They do not disappear as easily.

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Successfully complete the game to unlock everything in the gallery.

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Press and hold X+A+b at start menu

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In the gym (the room with the weights and treadmills), turn towards the mirror at the back wall. Switch to your Game Boy Horror's first person mode and examine the mirror with A. After a really trippy warp sequence, you will find yourself in the entrance hall of Luigi's Mansion.

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Although you cannot pull off the projection room screen, you can make it change. Give it a tug with the Poltergust 3000. If you are persistent, you will reveal a huge picture of a Boo.

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If you're running low on lifeforce, get out your vaccuum and start cleaning lamps and vases. Almost every second vase has a heart hidden inside and nearly every lamp or chandelier either yields money or health.

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Successfully complete the game and save. Go to the lab. Professor E. Gadds will ask where you want to go. Select the hidden mansion to play the game again with various differences..

You can get a different sized house at the end of the game, depending on your rank.

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

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While playing, hold B + X and press Start.

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When you press [A], Luigi will call "Mario!". The more damage Luigi has taken, the more desperate his call for Mario will be.

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After finding Mario, get close to the well or go down the ladder into the well, but stay on the ladder. Eventually, you will hear Mario calling "Hey, Luigi! What's the hold up?"

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Mario is located in the basement of the mansion. Once you have defeated the artist and have the key, go to the hallway next to it. Go to the door north of you. Open it and go inside. Walk through the small room, and open the other door. You will see King Boo, and Mario stuck in a painting. Walk up to King Boo and finish the conversation. When he turns around, he will enter his Bowser robot. You will be sucked up and teleport to the roof.

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When in the music room where you have to vacuum all the musical instruments, it will be playing the theme from all the Mario games. Note: This will also unlock the ghost for this room.

Successfully complete the game and you will eventually hear an upbeat version of music from Bowser's Castle from the original Super Mario Bros .

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After you get the water element, water every plant and bush you see. Each one will give you from 20 dollar bills to a giant gold diamond.

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On level two, when you catch five Boos go to the bathroom where you get key out of the toilet to find a painting of a Pokemon.

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Go to the room next to Madame Claiyova. Vacuum all the ghosts. Then, vacuum the big fire and a red coin will appear. Get that coin.

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There are two large rubies in the game. One is the King Boo's Crown and the other is hidden in a plant on the Boolosus Balcony.

On Area 2, after you defeat Spooky, walk near the entrance of the dog house and press [X]. Press [A] while aiming at the door to go to the graveyard. To your right will be a rain drain. Walk to it and press [A] to get a ruby.

After you get the Fire Element and defeat Mr. Luggs, go to the kitchen. Light the room and use your Fire Element at the stove next to the freezer and a ruby will appear.

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Water plants to get hidden rubies or gold in every room with a portrait of a ghost in it

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The first one is located on the first floor, in the south-west corner of the Mansion. After you have sucked in the candle-carrying butler, exmaine the room with your Game Boy Horror to find a mousehole. Press A to activate it and go inside to enter the trasure room. The second treasure room is accessible from the roof top. Use the elevator in the toy chamber to get on the roof, the go all the way to the right and climb up on the chimney. Fall down and you will land in another treasure room

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Running around from one end of the mansion to the other can be a very time consuming task. Thankfully, Nintendo has implemented hidden warps that let you zoom back to the entrance hall.

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Enter the twin's room. After you get the twins and the Boo inside their room, you can see a poster of the television show, "The Munsters" next to the bunk bed.

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Go into an unlit room, press [X], and scan something to stop Luigi from humming. If you listen to the growling of the monsters, you will notice that they are actually singing the Luigi's Mansion theme.

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In the room with the weights, punching bags etc.. there is a treadmill. Run on the treadmill and you'll get the key to the hall door just to the left of that room. With the hall door unlocked you won't have to run around the backside of the house to get to the stairs that lead to the second floor.

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(You need to have completed the twin's room first)
If you are low on health go straight to the twins room and come straight back out and enter the nursery next door.Go straight to the cabbinet by the door and vacum it.A 50 health heart will appear for you can use this cheat as many times as you want.(Does not work on hidden mansion)

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In several rooms, you may notice that there is a mirror there. If you search a mirror with the GameBoy Horror, you'll be warped back to the 1F Foyer. Note that this does not work with the mirror in the Mirror Room, though.

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