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heres the walkthrough
http://jayisgames.com/archives/2009/02/super_stacker_2.php#walkthrough
if u want it challenging, then dont click it..
enjoy walkthrough
Warship Destroyer Badge (hard – 30 points)
Destroy 801 warships to unlock the Destroyer or Warship in Starfighter: Disputed Galaxy
* 801 kills – ENDURANCE BADGE: This badge is more time-consuming than it is difficult!