Just what I needed!
The Switch version of Captain Toad: Treasure Tracker will be getting an update today and DLC next month.
Today's update will add the ability to play co-op with the second player controlling Captain Toadette. Also available for purchase today is a DLC bundle that will feature 18 new challenges across five worlds.
Buying the bundle or the DLC today will unlock a course's worth of challenges. The rest of the DLC will arrive on March 14