KOF 97 will work with the 4 meg cart,but it has a longer load time initially with it if I remember right,which was kinda annoying. Really its best to use the 1 meg cart on all the SNK titles I cant remember if the Real Bouts have problems or not,and I was thinking Metal Slug only liked the 1 meg cart,could be wrong on that though,as its been years since I messed with the Saturn ports.
My son got some Spongebob game for Wii, It actually controls well,and it seemed kinda fun,just not my type of game. So basically he has been playing that,and I am still playing Bad Day LA.