Development of "Serious Sam 2" began in mid-2003 with the decision to create the game on a new engine. Croteam planned to release the game in the second quarter of 2004, but this was later pushed to the second half of 2004 and finally to fall 2005. For a period of time, Croteam posted weekly updates, but these became bi-monthly, then monthly, and then stopped completely after August 2004, as Gathering of Developers shut down and folded into 2K Games, Croteam's publisher, wanted to handle the release of information from that point forward. In April 2005, the game was officially announced by 2K Games, at which point the release date was set as Fall 2005.