1: Same soundtrack
2: New cutscene in E. Gadd's lab.
3: Gooigi for Co-Op (Another player in the world plays the same game as you are and joins on your team)
4: Rebattle Boss ghosts at the Gallery. (And get the Gold portrait)
5: Remodeled, but an awesome version of the Gallery.
6: Achievements and ghost statue (s) with it.
7: Same ghosts and Portrait Bosses.
8: More detail and colors for the redesign on everything in this game. (I love it!)
9: Bottom screen map. (And shows the Bosses and stuff you got)
10: Go to the Lab from the Mansion doors.
11: Calls for Mario.
12: Same lightning sound (s) and effects.
13: Lights over Luigi and furniture shows the shadows in rooms. (Like it's in real life)
14: Use the GameBoy Horror. (Camera in 360 degree version)
15: Same training room and ghosts.
16: Catch 50 Boos
17: Coins/dollars last a bit more longer. (Unlike the GameCube version)
18: Speedy blue ghosts. (PAY DAY!!!!)
19: Save with Toad. (Balcony, 1F Foyer, Bathroom, and Courtyard shed)
20: Not in Mario's shadow.
21: Determined to save Mario from being trapped in a painting by King Boo.
22: Defeats King Boo/Bowser on his own. (Last boss)
23: Secret cutscene at the end of the game. (After credits are done)
24: Gather buttloads of money in every room inside of the Mansion. (Ultimate Pay Day!!!! XD)
YOU ARE READING
Luigi's Mansion stuff.
Short StoryJust short chapters of my review on the 1st game and listing down other theories (from SwankyBox on YouTube) that would make sense to me. And to all of the other Luigi's Mansion fans out there like myself! XD