"Pokémon Gold" and "Silver" were critically acclaimed upon release. They are considered by some to be the best games in the entire series, as well as some of the most significant games of the fifth generation of video game consoles. They continued the enormous success of "Pokémon Red" and "Blue" as "Pokémon" began to form into a multi-billion dollar franchise. The games almost matched the sales of "Red" and "Blue", and by 2010 had gone on to sell over 23 million units making them the best-selling games for the Game Boy Color and the third-best-selling for the Game Boy family of systems.