Robo Defense is the ultimate portable tower defense experience.  Featuring open maps, upgrades, achievements and nice graphics.  The full version features 5 maps with unlimited upgrades and difficulty levels.  A free version is also available (try it first!).  Free version progress is automatically imported into the full version, should you choose to upgrade. HTC Desire, San Francisco: Turning off "High Quality Graphics" fixes known issues.Galaxy S: Turn on "16-bit Backgrounds" to fix studdering performance issues.Atrix: Disable sound to improve stability Performance tips: If the game is running sluggishly, try playing fully  "zoomed in".  Turning off "High Quality Graphics Mode", in the options menu, will also help on some phone models.  http://lupislabs.blogspot.com

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