I just started thinking about new category ideas and these two came to mind. Two more categories that I think would work is getting the two unlockable stages. Luigi's Mansion and Daisy Cruiser. Luigi's Mansion meaning having to defeat Bowser Jr. in Mario Stadium and unlock the shop, then getting the money to purchase Luigi's Flashlight as quick as possible. Also, you would have to defeat Bowser Jr. to unlock nighttime mode. Daisy Cruiser having to defeat Bowser Jr. in Peach Ice Garden and then collecting the coins necessary to unlock the Cruiser pass in the shop. The timing would start as normal, but the timing would end when the text pops up on screen saying "____ is open" when in the hub world. Just a thought for two more short little categories that would be contained in challenge mode that could be fun to route and run :)