A week ago, I had absolutely no idea what the different versions of the US PS2 machine were, what mod chips were available, etc. After spending a lot of time reading the forums and various websites, I thought I'd share how I managed to get VF4 to work on my PS2, for those of you who might be interested. I am using a US PS2 (NTSC U/C), version 5. If you don't know what version your PS2 is, check this URL: http://www.consolesource.com/installation/p2-n22-mod/install.htm I am also using GameShark 2 v2.01 (or 1.99c, not exactly sure). I heard the knife-swap trick should work with GS2 v1.6, v1.9, v1.99, v2.01 and above, with all versions of the US PS2... versions 1 through 5. How to tell what version your GameShark 2 is: #1 if the GS2 box says "13,000 bonus codes" in the bottom left corner, you know you have a v1.99c/2.01. If it says "6,000 codes", it's either v1.6 or v1.9 (I think... not really sure). #2 the best way to check GS2 version number is to look at the inner ring of the CD-ROM at an angle to the light. (I bought my GS2 at a EBX retail store, btw.) Someone else on this forum mentioned the knife-swap trick, and I can verify that it works on my config. Again, the URL is http://cousinfizz.4mg.com . Using the homemade swap tool works best, check the first photo on this page for a template: http://cousinfizz.4mg.com/photo.html (the size of the swap tool is the length of a credit card, half the width). A little tricky when you first try the swap trick, but it's easy to do after awhile, really! With GS2 and the swap tool, I managed to get VF4 to work on my US PS2, without the use of any mods whatsoever. (I doubt I'll get a modchip until a version comes out that requires no soldering at all... there's a no-solder modchip available for Asian PS2s already).