In Luigi’s Mansion: Dark Moon on the Nintendo 3DS, you can unlock Scarescraper Mode, which contains several different multiplayer modes in a tower style game where you try to beat as many levels as possible that keep increasing in difficulty.
To unlock Scarescraper Mode, you just need to beat the Visual Tricks mission in Gloomy Manor.
You’ll access the Scarescraper in E. Gadd’s bunker. There are four modes available in Scarescraper Mode: Hunter Mode, Polterpup Mode, Rush Mode, and Surprise Mode.
Check out my other guides if you’re trying to unlock endless scarescrapers, unlock surprise mode for scarescraper mode, or unlock bonus missions.