If you've ever played JezzBall then you'll know what a challenging and addictive game it can be.
If you've never come across it before then give BallZ a try. This is a Palm OS 5-based clone of the popular Microsoft game. The object of the game is to contain the bouncing balls into progressively small rooms until 75 percent of the total screen space is cleared. You do this by splitting the blocks wither horizontally or vertically, without the line touching a ball.
There are 30 different levels to negotiate in BallZ, and what starts off as a gentle, almost relaxing diversion, soon becomes a frantic battle when there are lots of balls whizzing all over the place. Even on the easiest of the five difficulty levels things can get pretty hairy.
I particularly loved the soundtrack to BallZ - an electro reworking of a haunting classical music track - although this does become a bit repetitive. Thankfully, there are options for reducing the music and sound effects volume though.
It might not be the most graphically-rich game ever, but BallZ will certainly have you hooked for quite some time.