Sega's mostly forgotten 8-bitter hits the big 2-0.
If you're one of 90 percent of American kids who grew up in the late '80s loving videogames, you were the proud owner of a Nintendo Entertainment System. But what about the 10 percent who didn't play with power? Though they never knew the pleasures of Super Mario, a fortunate few discovered the Master System, an NES alternative from an up-and-coming Sega. This other 8-bit wonder has just turned 20--a momentous occasion for Sega nuts and fans of grids alike.