Analysis of information sources in references of the Wikipedia article "Pokémon Red & Blue" in Portuguese language version.
The Game Boy titles Pokémon Red and Pokémon Blue were released on September 27, 1998. They became the fastest-selling Game Boy titles ever, selling a combined 200,000 copies in the first two weeks of their availability. By the end of 1998 they had sold four million units in the US alone across three versions. In Japan, across four versions the game had sold nearly 12 million copies.
As of 28 November 2017, Pokémon Red and Pokémon Blue... were the best-selling videogames that have not been bundled with a console.
MissingNO is a programming quirk, and not a real part of the game
