Karl was hired at ICOM Simulations in 1987 after the company had already released its first two MacVenture games, Déjà Vu: A Nightmare Comes True, Uninvited, and while working on and finishing Shadowgate.

[4] The game was four times larger than the original Shadowgate and had been fully designed and scripted,[6] but ICOM Simulations got a contract with NEC to develop for the TurboGrafx-16.

[3][9] Then he joined a new company with his friend Dave Marsh and another former employee of ICOM Simulations: Eugene Evans.

[4] Eugene was the founder and president of a new video game production company called Infinite Ventures, and had obtained the rights to ICOM Simulation's original intellectual properties, including Shadowgate.

[13] The first project from Zojoi was a Kickstarter crowd funding campaign to remaster the Sherlock Holmes: Consulting Detective mysteries and release them for iOS and Android tablets as well as Windows and OS X platforms.

[14][15] Despite the unsuccessful Kickstarter campaign, Karl and Dave were able to obtain funding through other means for the Sherlock Holmes: Consulting Detective mysteries.

[16][17] The first three mysteries were released on September 18, 2012, over iTunes for the iPad 2 and newer models,[18] and on October 7, 2012, over Desura for Windows and OS X.