The Tectoy Master System Evolution is a video game console released by Tectoy in 2009 as a successor to the Tectoy Master System 3. It is a "console on a chip", containing 132 built-in Sega Master System games (Altered Beast was added, compared to its predecessor's list of games). Like previous releases, the number of games is debatable. For example, 20 em 1 is considered to represent 20 games.