http://www.siliconera.com/2013/01/22/luigis-mansion-dark-moon-has-online-multiplayer-download-play/Famitsu has tidbits about Luigi’s Mansion: Dark Moon and mentions the Nintendo 3DS game will have multiplayer modes. Famitsu says Luigi’s Mansion: Dark Moon will support download play, local play, and online play
Sweet! Hopefully online leaderboard too.