The status of challenge

Lessons are unlocked daily once you start the challenge in order to build solid learning habits and take user design skills to new heights.

However, the problem is which one I have already done for today?



When I take a break and come back later. I always frustrating to enter a card to figure out which one I didn't learn yet.

it seems a little problem but affects user emotion.

There are no states indicating which lesson is locked or unlocked. I think it will be better if it has an icon or some signifier to indicate the state.

P.S. the answer is 'Flows by Checklist Design' challenge