What was the name of the first handheld electronic game?

The answer is: Auto Race. This is hard to fathom, but the first fully digital handheld game was released by Mattel in 1976 — right around the time Atari’s home system was just gaining steam.Of course, the “screen” was essentially just some lights behind plastic, and the entire thing was made of solid-state electronics. Not much compared to the power you carry around in your pocket every day now, but Mattell kicked off a trend that is only continuing to grow to this day.Source