Hopper, Eni, and Josh have opened the portal into Flatland. Now all they need to do is go through it, rescue the second Turtle of Light, bring it back with them, and defeat Dr. One-Zero before he can enslave the world – and before their parents break up the group. This book wraps up the series in a satisfying way.

Why should I read this book?

This story combines coding with some geometry and does so in a way that is integrated with the narrative, interesting to student readers, and teaches fundamental coding principles while at the same time helping to change student attitudes toward science and math.

Who is this book best for?

Fourth grade through middle school.

Challenge Rating: No Challenge

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