One of the earliest engineering projects I helped with was in conjunction with a childhood friend. Together (ages 14 and 16) we designed, and built a pair of controllers for the then immensely popular game Dance Dance Revolution
The game pads featured several things that weren’t available on the commercial market:
In retrospect this was quite a challenge from a human interface design perspective. Building a interaction surface that interfaced with existing console gaming systems while simultaneously meeting needs for transportation and durability was quite daunting.