We found several variations of rules as we researched seven ball. It's not a big surprise since there are quite a few variations
of 8 Ball out there. Below you will find links to all the different versions of 7 Ball that we found. I have played the NAP version
and really enjoyed it. There's a version that considers a miss a foul and gives your opponent ball in hand also. That sounds interesting
to me and I may just give it a whirl one day. That may make a good training scenerio and they even say that on their site. However you
decide to play, Enjoy and have fun!