Joystick

Arduino Esplora has a joystick. It's always needed. Why not make a joystick-sensor for all Arduinoes?

Have you seen some that Sparkfun offers? https://www.sparkfun.com/search/results?term=joystick

Yes, but I mean the built-in ones, like in the Esplora.

Plus, it's only for the UNO.