Lol one thing I learned about building my cab - the work and fun never really ends . There is always something to add, etc to it. As for KI2, I have it running flawlessly in (i think) v103 - I'm not 100% sure if that's the right version, but I'll let ya know in a few hours or so when I get home . The MK4, like the reason why NFL Blitz doesn't work correctly as nullPointer explained, is a game that hasn't been fully emulated through mame yet. I'm sure though that in due time, these games will be more than likely working 100% in future releases of mame. It's good though to use a couple versions of mame if you have quite a number of games. One example is mwalk (Michael Jackson's Moonwalker)...in the main version of mame I have in my cab, mwalk looks grainy, discolored, and a little choppy. I have the mapping magician "telling" GameEx to open mwalk through the newer version of mame, where the game looks much, much better lol