This chapter from “The Computer Controller Cookbook,” published in 1983, demonstrates several easy-to-build Apple II hardware projects including how to:

• bring the paddle socket out of the case to a position beside the keyboard
  
• switch between paddles without interrupting the program currently running
  
• use two standard joysticks at once

A different chapter covers building a converter to use Atari joysticks on an Apple (and vice versa).