Sigma Levels 3-6 Tips and Strategies
By: BigStack Studios
This video walkthrough demonstrates how to beat Levels 3-6 without any power ups. Uploaded on MIT OpenCourseWare official channel at March 10, 2014.
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If you have any questions, feel free to ask for extra help in the comments section.
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Levels 3-6 Questions
Questions related to levels 3-6 of Sigma iPhone game.