[2] The three of them all worked on the commercially unsuccessful video game, Daikatana, which went through a turbulent development process before releasing in 2000 to negative reviews.

Case left Ion Storm in January 2001,[3] with Romero and Hall completing Anachronox before also leaving the company in July of that year.

According to Case, Romero became interested in the concept of mobile games towards the end of 1999, and wanted to see what was possible on handheld devices like the Pocket PC with a new company.

[6] Romero elaborated that he founded Monkeystone with the intent of directly working on programming video games full-time alongside Hall and Case.

[9] In October 2001, Monkeystone announced their first game, Hyperspace Delivery Boy!,[10] a Pocket PC title which began development in August 2001 and was released on December 23 of the same year.

[4][12][13] In August 2003, THQ Wireless announced that Monkeystone would develop a version of the 2001 console video game, Red Faction, for the Nokia N-Gage.

[20] Monkeystone also published titles by third parties such as Argentum, Rocket Elite, Bust Em, Night Shift, and others.