http://www.gameinformer.com/b/news/archive/2014/10/07/captain-toad-treasure-tracker-digs-up-december-5-release-date.aspx

Not to be overshadowed by Super Smash Bros. getting a release date, the crafty Captain Toad has marked his spot on the calendar (with an X of course). Nintendo has announced that you’ll be solving puzzles with Toad on December 5.

The puzzle game side story began as a minigame in 2013’s Super Mario 3D World. Now, Toad is starring in his own title, in which you’ll need to rotate the environment and platform your way through the maps.