Thin Chen Enterprise, also known as Sachen, was a Taiwanese company that published several original games for the Nintendo Entertainment System, Mega Drive, Game Boy and other early cartridge-based handheld systems such as the Watara Supervision and Mega Duck. With the exception of the latter two handhelds, all of Thin Chen's games were produced without license from the console manufacturers. The company produced at least 70 unique games for the NES and Famicom and at least 32 for the Game Boy, making it the most prolific unlicensed publisher for both consoles. The company also produced its own Nintendo Entertainment System hardware clones, such as the Q-Boy. Many of its games were released in an unfinished state, and received largely negative critical response.