Here's a guide of levels: 11-20 for the iOS app Isoball. Have you stuck in Isoball levels: 11-20? Watch this video which will guide you through from the beginning to the end with strategies, hints and tips for this level.
This tutorial it's a part of a complete Isoball level walkthroughs that were submitted by players for Isoball game on iphone, iPad or Android.
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Isoball level 20 video:
If you have any other information on how to pass Isoball levels: 11-20 - please post your tactics here. You can also find help with other levels in the Isoball walkthrough for all levels here.