I made a gaming control panel using an Arduino Leonardo to play simulators. Currently using it for DCS World, but it should work in most games just like any joystick / gamepad.
Joystick Controlled Mouse with Arduino
Arduino Joystick ile Fare Kontrolü • elektromanyetix
Lab: Mouse Control With Joystick – ITP Physical Computing
Create a Joystick Using the Arduino Joystick Library 2.0 : 12 Steps (with Pictures) - Instructables
Arduino ile Joystick Kullanımı-Arduino Joystick Uygulaması
Joystick Game Controller using Arduino Leonardo | Arduino, Microcontroller board, Game controller
Using joystick in a game - Programming Questions - Arduino Forum
Arduino Leonardo/Micro As Game Controller/Joystick : 10 Steps - Instructables