@Htbaa @candle The original Nyko worm light was one of the very first commercial devices ever to contain a white LED! (LEDs were commercialized in the '60s but the problem of getting them to make white light was only cracked in '96, two years before the original worm light released.)
It was mainly just hard on your batteries by comparison-- Game Boys are *incredibly* low-power. Any flashlight, even an LED flashlight, is a comparatively high-draw device!
Weirdly, the key to making white LEDs was making the impossible blue, to up-shift with phosphors.
One day we will get beyond hardware designers thinking we want every device we own to have a harsh blue standby light.
Edit: AA cells were so much worse back then, weren't they? A modern no-name provides more.