Hi - I see not a lot of people aren't crazy about this little unit. I like it...Oh well..
I found a solution for turning P2's difficulty switch between Hard and Easy. It's not in the directions that I saw. It's possible it's been found already but I did a search and didn't see it. But if it's out there, feel free to ignore.
As we all know, when the Difficulty button is pressed, both P1 and P2 settings are displayed, but pressing the Difficulty button multiple times only toggles between P1's Hard and Easy setting, and P2's settings aren't affected.
The solution is, while the settings are displayed (they continue to display a couple seconds after the Difficulty button is pressed, so technically you don't have to hold the Difficulty button down while doing this), Button B allows you to toggle between P2's Easy and Hard settings.
Enjoy! 😄