The rules given on the page provided by Scaramouche are close but not quite right.
Here is a summary of differences with standard snooker:
- the table is smaller (1.42 m x 2.84 m)
- there is only one red
- all fouls cost 7
- normally, you play the ball "on" in sequence. However, after potting the ball "on" (even a colour), you can always pot a colour which is respotted.
- Before you play the ball "on" you may play a penalty ball that costs you 7 if not potted. It is respotted if potted.
It is actually this penalty ball that makes the game agressive since it is used to try to set up a better shot on the ball "on". As a result, a good player can clear the table. Safeties are a lot harder to achieve since you have to hide from *all* balls. The only real good safety is to lodge the ball "on" against the rail. Then you may give away a penalty ball to your opponent but he/she will probably not go further.
Very agressive game and tons of fun!
By the way, this is *the* game in Brazil. There is essentially no pool here.