Nintendo's new WarioWare game contains Luigi's Mansion beta assets

Fans are using the E3 2001 graphics to rebuild a pre-release version of the…

List of Luigi's Mansion pre-release and unused content - Super Mario Wiki, the Mario encyclopedia

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Luigi's mansion iceberg : r/LuigisMansion

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What is the canon timeline to the 'Super Mario' games? What games do I have to play in which order? - Quora

WarioWare: Get It Together! Contains High-Res Assets From Luigi's Mansion E3 2001 Demo

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Luigi's Mansion dans WarioWare Get It Together

Nintendo First Party Software Development, ST, Nintendo Party Superstars, Page 45