Thin Chen Enterprise
Thin Chen Enterprise (full name Sheng Qian Enterprise Co., Ltd (Chinese: 聖謙企業股份有限公司)), also known as Sachen, was a Taiwanese company that developed several original games for the NES, 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 (compiled into eight 4-in-1 cartridges), making it the most prolific unlicensed developer and publisher for both consoles. The company also produced its own Nintendo Entertainment System hardware clones, such as the Q-Boy.Most of Thin Chen's products were released under the "Sachen" brand name, although the names Joy Van and Commin were also used for certain early games for the Famicom and handheld consoles respectively. Several of their NES games were released outside Taiwan under license by foreign publishers, including: HES Interactive in Australia, Hacker International in Japan (usually with added pornographic content), Bunch Games/Color Dreams and American Video Entertainment in the United States, and Milmar in Brazil.

Developed games
Nintendo Entertainment System/Family Computer
List of titles as Thin Chen
List of titles as Sachen
List of titles as Joy Van
Multi-game cartridges
Note: All series of Super Cartridge Version, was developed and released as Thin Chen Enterprise.

Others
Mystical Muppet Mahjong [AKA Ti Xian Muou Majiang] — A port of Tel-Tel Mahjong.
--Unknown-- — A TC-031 numbered series game.

Unreleased
Bridge
Twin Ball

Game Boy/Game Boy Color
List of titles as Sachen
List of titles as Commin
Multi-game cartridges
Sega Genesis/Mega Drive
Both two games were developed and copyrighted as Thin Chen Enterprise co., as seen on the title screen. However, the name Sachen also appears on the opening screen.

Watara Supervision
All games, both as Thin Chen Enterprise that as Sachen, were all made in 1992 with the only exception of Kung-Fu Street, which was made in 1993.

Mega Duck
Each Mega Duck/Cougar Boy game is similarly labeled as the same games were marketed for both systems. The notation MDxxx is used for Mega Duck Games, and the notation CBxxx for a Cougar Boy Games. A MD002 is exactly the same game as the CB002, even to a point that some "Cougar Boy" games start up with a Mega Duck logo.
All of the games released for the Mega Duck were subsequently available on the Game Boy.

See also
Multicart
Caltron
NTDEC

References
External links
Thin Chen Enterprise/Sachen at BootlegGames Wiki.
Thin Chen Enterprise/Sachen profile on GameFAQs
A picture of two Sachen multicart games