Analysis of information sources in references of the Wikipedia article "1991 in video games" in English language version.
Master
1991 0.0
1990 0.3
Traditionally, dominated by Japanese vendors, the market had reached 2.5 million units in 1989, and 3.3 million units in 1991 (Dataquest Inc.)
The Sega Game Gear, a portable video game system, was also released in 1991. Game Gear featured a color display with an 8-bit microprocessor, it was an instant success, selling over 600,000 units in its first year.
#2 - The Legend of Zelda: A Link to the Past (1991) / #1 - Super Mario Kart (1992)
1991: Sonic the Hedgehog
1991 - The Legend Of Zelda: A Link To The Past