Back in the day I used to play JezzBall and Qix for hours. Padadaz had exactly that in mind when they developed Bix for BlackBerry. The game is kind of like the classic Qix and Jezzball with a mix of Snake and Tetris. It just reminds me of gaming back in the day when the simplest of games managed to thoroughly engage you.
If you are an addict like me you can pick up Bix in the store for $2.99 at this link. It is available both for touchscreen and non touchscreen devices and only requires OS 4.3+.
Check out a video of the game in action on an iPod Touch below to get an idea of what gameplay is like.