Special Issue on GaLA Conf 2020

International audience; This special issue of the International Journal of Serious Games offers very valuable extensions to the best papers of the 2020 edition of the GaLA conference. The local organization committee was composed of computer scientists of Laval (France), affiliated to Le Mans Université. From the 9th to the 10th of December 2020, 500 participants attended to a well-organized conference, through their virtual avatars, and listened to 37 presentations on Serious Games and Gamification. A special session was related to Virtual Reality, in a pedagogical and gaming context. The four extended papers, published in this journal, significantly extend their original work, and were accepted through a regular peer-review process for this special issue.