Rooftop (Luigi's Mansion 3)

The Rooftop is the highest point of The Last Resort in Luigi's Mansion 3. The final battle against King Boo takes place here. The Virtual Boo has no map for the Rooftop or the stairway leading up to it; it simply displays Luigi's location as "???". This area is only referred to by name on the file selection screen.

After Luigi (alongside Mario) frees Princess Peach with his Dark-Light Device, they have a brief reunion; only to be interrupted by King Boo appearing behind them. He is surprised that Luigi has made it this far and angered that he should have run away. King Boo attempts to trap everyone including Professor E. Gadd and three Toads into one big frame; he successfully captures everyone except Luigi, who was saved by Polterpup. King Boo is even more angered that he did not capture Luigi and decides to have a battle with him.

Battle
King Boo can summon lightning onto many squares that shine purple light; Luigi must avoid this by going to an area that does not shine purple light. He can also slam his tongue to the ground; Luigi must use Burst to dodge the swinging attack. He can also throw out lava balls from his crown while it is orange. King Boo then throws out a spike with bombs, in which Luigi must launch the bomb back into his mouth; after he explodes, Luigi and Gooigi must work together to slam King Boo a few times.

In his second phase, King Boo summons a fake version of himself lacking any two front teeth, and has no eyes; their tongue attack can spin which Luigi needs to go underneath it if there's an opening. They can also slam onto the ground; the fake King Boo does not create a shock wave while the real King Boo does; Luigi must use Burst to dodge the wave. They throw two spikes, one with bombs and one that Luigi can suck up to restore HP; Luigi must launch a bomb back into the real King Boo.

In his final phase, King Boo makes the frame much larger, thus giving Luigi four minutes to defeat him. King Boo summons two fake versions of himself. They may throw out six spikes with bombs inside, where several bombs subsequently rain down. Once again Luigi must launch a bomb back into the real King Boo; after Luigi and Gooigi slammed King Boo a final time, he is sucked into the Poltergust G-00 and releasing his Gem Crown.