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Ex-Sachen developers refers to two unknown but similar contract development teams that mostly consist of ex-Sachen staff. Both have worked on a number of bootleg ports and other unlicensed games for the Famicom in the mid to late 90s.


Around 1995, Sachen's Famicom development seems to have halted, only releasing a few titles (such as Gaiapolis and Rocman X) that year. The team seems to have completely disbanded around this time although Sachen itself would remain and occasionally contract out development to some of their original members.

One of these teams that formed seems to be led by Wenguang Yang (楊文光). This group started off making a few games for short-lived publishers but then became a major developer for Ka Sheng. Much of their earlier output (with the exception of Chu Da D) mainly relied on The Dragon's engine or at least, each game was built off of it or its successors. However, this seems to have been dropped by Earthworm Jim 2. This team has often gone uncredited with Bao Qing Tian being the only game listing any members.

The other team seems to be led by Ei-How Yang (楊逸豪, also known as E.H.Y. and variations such as Yi-How Yang), who mostly worked on Game Boy titles for Sachen. Ei-How Yang also seems to be the lead programmer, having a hidden credit in his leftover debug menus. Ei-How Yang's team originally worked for J.Y. Company but possibly due to a contract breach on that team's part (Contra Spirits was supposed to be published by them but never was and Mickey Mania 7 never saw a J.Y. multicart release)m they've moved onto Hosenkan Electronics and eventually Ka Sheng. Much of the team remains obscure, as the names between both Mickey Mania 7 and Toy Story seem to be inconsistent and some may have been inserted as jokes. (An example of this is "Lee Dan Fai", who has shown up as a programmer and director. This is actually the Cantonese romanization of Lee Teng-hui, the then-current president of Taiwan.)

Both teams share certain features with each other, such as fonts, sound and graphics storage methods but both use different engines. Yueli Wang (王樂禮) was the composer for both teams, as he's credited in Bao Qing Tian as well as Mickey Mania 7 and Toy Story (as "Uo Lee" and "U.L. Wang" respectively). Outside of Wang Yueli, it's unknown if either team shared any other members or even worked together at any point.

Staff List


  • Yulei Wang (王樂禮) (UO Lee in Mickey Mania 7 and U. L. Wang in Toy Story) - Composer and possibly sound designer for both teams. He originally worked for Sachen, often under the name Amadeus Wang.

Wenguang Yang's Team

Staff list was derived from Bao Qing Tian.

  • Wenguang Yang (楊文光) - Director and planner for Bao Qing Tian. He may have also been the head of the team judging by his roles.
  • Zhenhong Wu (吳振宏) - The only known programmer.
  • Nianzhen Wang (王念珍) - Graphic artist
  • Ruici Liu (劉瑞慈) - Graphic artist
  • Zheng Luo (羅政) - Tester

Ei-How Yang's Team

Staff list was derived from Mickey Mania 7 and Toy Story.


  • Ei-How Yang (楊逸豪) (Copyright Yang in Mickey Mania 7, E.H.Y. in Toy Story - Lead programmer, possible sound designer and the head of the team. He originally worked for Sachen as a programmer and a sound designer for their Famicom and Game Boy games.

Similar Credits

  • Mindy Lee (Mickey Mania 7)/Sammy Lee (Toy Story) - Programmer for both games.
  • David Chen (Mickey Mania 7)/L.S. Chen (Toy Story) - Programmer for both games.
  • Little Fat Yang (Mickey Mania 7)/Little Fat Wang (Toy Story) - Graphics artist for both games.


  • Douglas Y E (Douglas Y.E?) - Programmer for Mickey Mania 7.
  • Ton Chen Jan - Programmer for Toy Story.
  • Tom Wang - Programmer for Toy Story.
  • Steve Hon - Graphic artist for Toy Story.
  • Big Henry - Graphic artist for Mickey Mania 7. (Might be a joke alias for Steve Hon?)
  • W.C.W. - These initials appear along with Ei-How Yang's initials in Toy Story but don't seem to match any known names.

Deconfirmed / Jokes

  • Lee Dan Fei - As stated above, this is the Cantonese romanization for Lee Teng-hui. He's listed as a programmer for Mickey Mania 7 and a director for Toy Story, possibly making this another alias for Ei-How Yang.
  • Fat Goo Goo - Director for Mickey Mania 7, most likely another joke alias for Ei-How Yang.


Wenguang Yang

Name Console Released Description Cartridge No.
Bao Qing Tian Famicom 1996 Published by Ka Sheng. First print had no ID.

NT-679 (Reprint)

Chu Da D Famicom 1995 Developed by Fortune Power & Ex-Sachen developers, Published by Jichang.
Earthworm Jim 2 Famicom 1997 Published by Ka Sheng. Earthworm Jim 4 also published by them features new levels. NT-849
NT-855 (reprint?)
Earthworm Jim 4 NT-868
Super Donkey Kong 2 Famicom 1997 Published by Ka Sheng, credited to Family & Gold Leopard. NT-866
NT-869 (reprint)
The Dragon Famicom 1995 Published by Ramar International (Rinco)/Tony Tech). NT-614 (reprint)
The Panda Prince Famicom 1996 Published by Ka Sheng. Super Lion King 2 also released by them features new levels. NT-858
NT-879 (reprint?)
Super Lion King 2 1997 NT-6093

Ei-How Yang

Name Console Released Description Cartridge No.
Contra Spirits Famicom 1995-1996 Published by Realtec, was originally intended for J.Y. Company. H-C1
Mickey Mania 7 Famicom 1996 Published by J.Y. Company. JY-077
China Rabbit Baby JY-076
Pocohontos Famicom 1997 Published by Hosenkan Electronics.
Super Donkey Kong Famicom September 1996 Published by Hosenkan Electronics.
Toy Story Famicom March 1997 Published by Ka Sheng. NT-889
NT-308 (reprint)

Famiclone games

Several games have appeared built into Famiclones dating from around the mid-late 2000s, such as the handheld D-Cat 8 and AtGames' Millennium Super Arcade (a hybrid Firecore/Famiclone system, albeit with only a Mega Drive cartridge slot) which appear to exhibit connections with Sachen and its former developers:

  • Jungle Adventure - An extremely glitchy hack of The Panda Prince containing only the boss fights from that game (including the unused wasp). Each boss can take many more hits than in the original, but from the second stage onwards it is prone to crashing. Strangely enough, the track that plays is a rendition of The Pits theme from Rex Soft's Boogerman II.
  • Survival of the Fittest - A Panda Prince hack featuring Simba; starts in a water level.
  • Pit Boss - A Panda Prince hack; starts in a minecart level.
  • Lair's Secret- A hack of Rockball by Sachen, using music from Panda Prince.
  • Magic Block - A Tetris clone, not known to be a hack of any previously released game, but using the same sound engine as these games and a text font seen in many Sachen games.
  • Attack Force - no further details are known.
  • Space War3 - no further details are known.

Other connections

  • Fonts used in games by these developers have appeared in Makon Soft's Game Boy games, as well as Sachen's GBC ports of their NES games.
    • The letter blocks on the game over screen for Makon Soft's Super Donkey Kong 3 were reused in Jungle Adventure as well.
  • Sachen itself did not release any original games from about 1997 until 1999, when they released Game Boy Color port of Jurassic Boy 2, Rocman X, and Street Heroes. While Rocman X appears to have been developed by Makon Soft, the other two are higher quality than Makon Soft's games. Two other GBC fighting games, Street Fighter Zero 4 and Capcom vs SNK: Millennium Fight 2001, share certain similarities with Street Heroes. These may have been developed by the same or a related group of ex-Sachen staff, most likely Ei-How Yang.
    • The GBC port of Jurassic Boy 2 also features Buzz Lightyear directly from Toy Story as a boss.
    • Street Fighter Zero 4 reuses tracks from not only Jurassic Boy 2 but The Dragon and Contra Spirits. While Ei-How Yang is known to have made Contra Spirits, The Dragon was developed by the other unrelated team. It's possible either Ei-How Yang may have also helped with The Dragon or Wang Yulei also assisted with the music.