The Game Boy Micro is a handheld game console developed and marketed by Nintendo. It was released in Japan on September 13, 2005, and in other regions later that year. A miniaturized version of the Game Boy Advance, it was the last in the Game Boy line. Unlike other Game Boy Advance models, the Micro lacks backward compatibility for original Game Boy and Game Boy Color games. It failed to meet Nintendo's sales expectations, having sold about 2.4 million units worldwide.