My plans
Run one goal or several. A problem you've solved counts everywhere it appears, so a second plan never costs you work you have already done.
Archived
Two kinds of reset
Start again puts you back at the beginning of a plan. Your record of what you solved is untouched, so problems you've already done still show as done.
Forget my attempts deletes the record itself. That can't be undone, so it asks first, and it's never part of starting a plan again.