"Based on LCD technology - which was still fairly impressive back then, yet highly affordable - this assortment of handheld games essentially wrote the rulebook that mobile gaming devices still slavishly adhere to even today. They were lightweight, extremely compact, highly portable and, most importantly of all, addictive as hell. The first wave of titles appeared in 1980, and although they didn't sell spectacularly Nintendo stuck with the concept and later models started to pick up speed. The range was groundbreaking in many ways; for example, 1982's Donkey Kong Jr was the first game to feature four buttons for directional movement (as opposed to a joystick)."
- Derrick
from Bookmarklet