I have been playing Balloon Gunner 3D on my PlayBook and loving it. Zach at CrackBerry noticed that LanguageBug has brought the awesome game to BlackBerry smartphones and it is free. The game is only available for BlackBerry 7 devices (Bold & Torch models) which probably requires the OpenGL and faster 1Ghz+ processors. Just like the PlayBook game this also offers a Stereoscopic (red+cyan glasses) 3D experience if you set the 3D option though you can play it either way.
If you have a BlackBerry 7 Bold or Torch I HIGHLY recommend checking out Balloon Gunner 3D in App World. Check out the video demo below to get an idea of the game: