Cake is a game for 4-6 players. The game consists of frames and the person with the most frames won is the winner of the game. At the beginning of the game the order of the play is decided the following way: The numbers from 2 to 7 are written on separate paper pieces which are folded up so that the number cannot be seen, put into the ball case and shuffled. Then each player takes one piece and the order of the play is the order of the taken numbers. The paper pieces are put back, they will be needed during the game, too.
At the beginning of each frame, all the object balls are set up to form a triangle with 6 red balls on the edges and the colours in the middle (hence the name "cake"). The triangle is placed like in snooker, but the apex red stands on the pink spot. The first shot of the frame, played from the "D", should look like a breaking in pool and at least two object balls must hit a cushion or a red must enter a pocket or the shot is a foul (oh poor cue tip and poor balls, but this was the worst part of the game, I promise you ;-). Every player has zero points at the beginning of the frame, and each foul counts as minus one (this is best handled by setting the pointers of the scoreboard to ten initially).
Apart from these, the normal snooker rules apply. That is, it is a foul to touch balls, to force balls off the table, to cause the white enter a pocket, to shoot with none of the legs touching the floor and so on. The player remains at the table if he could pot a ball "cake-legally". There are no such rules as "free ball", "you fouled, please shoot again" etc. For better players the two-point limit for potting colours can be raised to three.
There is quite a bit of luck involved in "cake", which enables weaker players to win. Of course this game has completely different tactical approaches than snooker, but this is what makes it "interesting". For example, it is sometimes a good idea to pretend that you're trying to pot your colour into the center pocket (making sure you don't, of course). If your colour is no longer on the table (or it wasn't there even when you took the paper piece ;), try to get rid of all the other colours, so that the others can't win. Always try to guess what colour is whose and play according to this, if you can.