Three-Ball is a weapon very Similar to Shot, with the same damage (10 points) but shooting 3 balls at the same time with a greater impact on the terrain.
Upgrades
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 balls there are, the less damage done per ball. Each level has greater potential to change the terrain.
Upsides and Downsides
Three-Ball is good to hit several enemies at a time. Well used, can put an enemy in a hole. Accuracy requires precision firing, especially at long range.