I created video editorial for D. Iris and Game on the Tree from last Codeforces Round.

https://youtu.be/xDYXvn0NfA0?si=pe3Tzwb3z-CDWZoA

I also created a practice contest containing 3 Game Theory Problems (that I will keep updating in future). https://mirror.codeforces.com/group/7Dn3ObOpau/contest/546860