SANiK on the X-Cult forum has wrote an interesting post about the early screenshots of Coded Arms for the PSP. The game is a first-person shooter that was developed and published by Konami in 2005: it takes place inside a virtual reality military training simulator, which has been abandoned. However, the program continues to run, generating enemies for the no longer present soldiers-in-training. The player takes the role of one of the many hackers attempting to break the codes of the simulator and derive the most valuable data possible. [Info from Wikipedia]
The projects started as an horror FPS, with outdoor areas and human buildings instead of the virtual reality program levels, but it seems that Konami decided to change it through the development. Other differences are in the HUD, some removed bosses, different enemies death animation and the style of power-ups. You can read the full topic at the X-Cult forum.