I suggest adding a Delete button to the Mutation/Submission booster tool. I would probably put it between the number input field and the Next button. Clicking it would delete the numbered entry from the list and then refresh the puzzle display with the new design at that number (or the prev one, and decrement the number if it was the last in the list). I currently do this process manually when stepping through a large set of generated mutants, but it is slow and error prone. Having a way to delete an entry with one click would be helpful. Thanks for the tool!