Just seen these variations on a website thought they looked different and all that
7 BALL POOL
is played like 9-ball but it use balls one through 7 instead. The 7-ball is racked in the middle, just like 8-ball and 9-ball, and the remaining balls go in a circle around it. You have to make the balls in order until the 7-ball is the last ball on the table.
There is big difference in this version of pool. Before the game, you pick a side of the table that will be your side to make the 7-ball. The person that is not breaking chooses the sides. Once you are down to just the 7-ball, you must make the 7-ball in a pocket that is on your side of the table to win. If you make the ball on the other players' side then you lose.
BOBCAT POOL
To play bobcat pool, two balls are placed near each pocket. The balls do not have to be in a certain order. The rack is placed in the middle of the table. The object of the game is to make at least one ball on every shoot without missing or a ball making contact with the rack. To start the game the cue ball is placed behind the head string and shot at a ball that is below the head string. For a little extra difficulty another ball can be placed in the rack. Once all the balls are made, remove the rack and try to make the extra ball.
CIRCLES
Circles is a variation on 8-ball or 9-ball. The table is racked the same way and you break the same way. The rules are pretty much the same with the exception of shooting the cue ball into an object ball. The object ball is shot into the cue ball.