Codingame AI Challenges are contests where you have to create the best possible AI for a given game during a week. The bots of every participants fight each other to determine which is the best. I did some challenges during my IT studies, and hosted CodinHub (several programmers participating in the contest together). My best placement is 89/2715 on the Hypersonic challenge (bomberman-like), using a genetic algorithm! I'm planning on doing contests again.

https://www.youtube.com/watch?v=YMevF-tqwqo