Tic-Tac-Toe
CyanCoding (1415)

https://repl.it/@CyanCoding/Tic-Tac-Toe

As a fun side project, I built this awesome Tic-Tac-Toe game (with three AI levels) in May 2017.

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CyanCoding (1415)

@govind05: I tagged it as impossible because until I had published it on the I built this challenge, nobody had ever beaten it before. I didn't even know it was possible! Now, I just leave it in there so that people think there's no way and keep trying until they figure it out.