PS1 - Hidden & Dangerous - Mission 1-2 - Heart of Bell 

It's pretty sad that the PS1 version really doesn't look as amazing as it could have been, considering that this port was made on an extremely and I do mean, EXTREMELY low budget, and that it was also part of Take2's $9.99 range, except that this port never received a US release (for some reason), given it's incredibly low production values. As a result, it became one of the worst PC to PS1 ports of all time due to it being incredibly watered down and reduced to a simple shoot-em-up, in where all you do is just move forward and pull the trigger when you see enemies on-screen since there is Doom-style Auto-Aim, while you complete various objectives you are given along the way, which completely takes away the tactical aspect that the original PC game and the Dreamcast port even had.

Ah wow that is a shame. Still nonetheless interesting seeing this on the PSX in the first place. I might have to try emulating it on my jailbroke PS3 just to check it out. On the Dreamcast version it has pretty great controls with the mouse and keyboard, even had lean if I recall correctly, but they did OK with the controller despite it lacking another joystick.

Yes. Way way WAY different. For one, the entire game has been reduced to a bare-bones FPS with autoaim functions, only one person with your other teammates acting as lives, and no indications as to where your objective is and how you complete it. It's AWFUL.