I have completed RE4 for the PS2 on normal mode and I am working my way through the professional difficulty setting to get the new weapons. I especially like the new mini game and the new unlockables that come with the PS2 version.
The new features that come with the PS2 version are
New chapters, you play as Ada Wong in Separate Ways.
New weapons, which includs the PRL 412 laser cannon and the gunpowder bowgun
New unlockable costumes for Leon and Ashley.
If anyone here plays professional, how do you get through the insanely difficult to kill enemies? I started a professional game but quit since I kept running out of ammo and getting killed by run of the mill villagers.
From the very start, collect all the ammo possible and don't kill anyone that you can get around. Knife them in the head and kick them, or shoot/knife them in the leg if they're running at you.
Has anyone here ever tried to beat the entire game without using any of the merchants? I found out about this guy, Vincent Merken, who wrote a walkthrough and put up a video someplace for a no merchants run through RE4. He also did a handgun only guide.