Zeno Clash is a project born thanks to another that failed. Years before we even started working with the Source Engine, ACE Team was granted a demo license of the Lithtech's Jupiter System, the same engine used by Monolith's No One Live Forever 2, with which we tried to create a game we called Zenozoik. The goal of this project was to create an action / RPG in first person, but the demo we built never took off -- mainly because as a team we tried to produce something too complex for a start-up studio.
Many years after this failed attempt we gathered around our original concept and re-thought the game in a manner that would focus on few but solid elements, those that we would be able to produce as a small team. This was the birth of Zeno Clash.