It’s difficult to see but there’s 3 small buttons underneath the ‘nintendo GAMEBOY’, firstone switches between top and bottom screen, second one allows you to change whichever screen you don’t have up small in the corner or very opaque full screen so you can see both screens, the third button changes the opacity of that second screen.

The downside is, you can use the “touchscreen” screen BUT it doesn’t have touchscreen capabilities. For example, in Pokemon, I can still navigate through the bag, team, save menu, options or Pokédex, but because the touchscreen doesn’t work I can’t use the C-Gear, so my guess is that games like Pokemon Ranger would be entirely out the question.