-For animation, moves should contains "moving" and "fading" maybe...
-Depth 2 or 3 depending on variant and if we detect smartphone or not?
-(static get SEARCH_DEPTH() { return 2; })
-Sur page d'accueil lien "contact" avec mail + instrus en cas de bug
+Finish showProblem() in components/problemSummary.js (send event with infos, and pass message to game component)
+Add new mode in game component: "problem", in which we show description + hidden solution (reveal on click)