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Thanks to our two highly qualified editors of this series, Sandra Schamroth Abrams and Hannah R. Gerber, for their thoughtful and encouraging feedback on the manuscript. It has been quite a journey to create this book and we would not have gotten here without your help. Also thanks to our anonymous reviewers for all their critical and constructive comments, who helped to improve the chapters. A special thanks to Pernille Toftgaard Christensen for her assistance with proofreading and formatting. We would also like to thank all the participants at the three NORDGOLD (Nordic Network on Game-Oriented Learning Designs) PhD seminars held in Copenhagen, Oslo and Stockholm for their excellent presentations, which sparked the initial idea for this book.