Brain Cube by Ximad
I'm always looking for games that are challenging, yet don't require tons of time and that I can play in idle moments. I was happy to discover Brain Cube by Ximad, as I used to play a similar game on my Bold 9000 a couple years ago, and it was a lot of fun.

The concept is easy: roll your cube through the puzzle to the hole on the other side. There are different obstacles to overcome on each level, making them all unique and a fun addition to this game over ones I played in the past are special squares that when landed on in the right way change either your cube or the puzzle itself. The interface is easy to use either with the trackpad/trackball or touchscreen. The graphics in Brain Cube are really decent and fun to look at, and playing it on my Torch was smooth.

Brain Cube is available for $1.99 in the CrackBerry store and is compatible with BlackBerry Bold 9000, Bold/Tour 96xx, Bold 97xx, Curve 8330/8350i, Curve 85xx, Curve 89xx, Curve 93xx 3G, Storm 95xx, and Torch 9800.

For more information/screenshots/video and to purchase Brain Cube