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The 1.4.0 patch addressed several "soft-lock" issues that could prevent players from completing the main story:

Update 1.4.0 significantly expanded the game's multiplayer capabilities and added special features for long-time players.

: A new "Art Viewer" feature was added to the Gallery (accessible via Story → Gallery → Special Content), allowing players to view development-stage illustrations. Critical Bug Fixes and Improvements Luigi-Mansion-3-NSP-Update-1---40-1--41-.4.0-Mu...

: Luigi can now wear the Amazing Luigi , Paleontoluigist , and Cap’n Weegee outfits in ScareScraper mode.

: Fixed progress-stopping glitches during battles with King Boo , Goobs in the Grand Lobby, and Amadeus Wolfgeist . : Fixed progress-stopping glitches during battles with King

: Wearing these costumes unlocks special floor themes based on the Twisted Suites, the Unnatural History Museum, and The Spectral Catch.

: Three new games were added: PuckStravaganza (air hockey), Floaty Frenzy (water-based race), and Desperate Measures (sand-balancing challenge). : Fixed numerous issues where keys would appear

: Fixed numerous issues where keys would appear in unreachable locations or players would be unable to progress after a teammate disconnected. Technical Specifications (NSP/XCI)