Maybe I'm wrong, but it seems a tad confusing for the average layman what the difficulty is. Through all the years, 99 percent of the people who refer to the difficulty settings don't call it difficulty 1,2,3, or 4. It doesn't seem clearly definable from what I see.
Why not add the description to the number designation, making it both unambiguous and intuitive?
Donkey Kong 3 High Score List
Difficulty 1 (Easy) - Marathon
Donkey Kong 3 High Score List
Difficulty 1 (Easy) - 5 Man
Donkey Kong 3 High Score List
Difficulty 2 (Medium) - Marathon
Donkey Kong 3 High Score List
Difficulty 2 (Medium) - 5 Man
Donkey Kong 3 High Score List
Difficulty 3 (Hard) - Marathon
Donkey Kong 3 High Score List
Difficulty 3 (Hard) - 5 Man
Donkey Kong 3 High Score List
Difficulty 4 (Hardest) - Marathon
Donkey Kong 3 High Score List
Difficulty 4 (Hardest) - 5 Man