If you have a smartphone like the iPhone, with a touchscreen, but miss tactile buttons when it comes to playing games, then check out the Tactile+Plus adhesives. They are stickers with raised bumps so you can feel them and press on them like a game controller.
You will no longer have to carry around a game pad adapter, since it’s on your phone already. The kit includes an 8-way circular control pad and 4 individual key buttons that mimic the Gameboy system.
It costs under $8 and comes with two sets of buttons.