Lindberg, Renny S. N., and Teemu H. Laine. “Formative Evaluation of an Adaptive Game for Engaging Learners of Programming Concepts in K-12”. International Journal of Serious Games 5, no. 2 (June 18, 2018): 3–24. Accessed August 19, 2022. https://journal.seriousgamessociety.org/index.php/IJSG/article/view/220.