It's been some time now since the site changed to the "Scatter" type.
Being able to re-view or replay challenges is very nice but I'd like to suggest another change.
Perhaps the challenges could have names ? Just some additional text on the challenge page itself which could say something like "Pokemon" or "Dice" as two examples. Such a label would be much easier to remember than "7" or "21" etc.
No need for the names as part of the site's navigation IMO. Just a label we could use for posts or discussions. < or complaints , should that ever happen ;->