Twenty Years of Progress of $$\hbox {JCDCG}^3$$JCDCG3

The conferences in the series of the Japan Conference on Discrete and Computational Geometry, Graphs and Games ($$\hbox {JCDCG}^3$$) have been held annually since 1997, except for 2008. Since 1997, almost one thousand research results have been presented in total at the conferences, and 11 post-conference proceedings and 6 special issues of journals have been published. To celebrate the 20th Anniversary of $$\hbox {JCDCG}^3$$, a summary of the notable results published in those proceedings are presented in this article. We focus on six areas such as games and puzzles, dissection and reversibility, foldings and unfoldings, point sets, visibility, and geometric and topological graph theory.