Three-Ball is a weapon very Similar to Shot, with the same damage (10 points) but shooting 3 ball at the same time.
Upgrades
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Five-Ball, Eleven-Ball and TwentyFive-Ball ===
Each one of them are doing the same thing as Three-Ball, but with 5, 11 and 25 balls at the same time respectively. The more ball there is, the less damage done.
Upsides and Downsides
Three-Ball is good to hit several enemy at a time, and well used, it can put an enemy in a hole. A little hard to use in long distance shot.