UPDATE: I am currently working on an update where the player can choose to go first. It will take a while, but if it interests you, you can track my progress in the code. Simply click the square that you would like to place your piece in.
This is my first AI, so please love it. It is a simple Tic-Tac-Toe AI that you will lose to almost every time, unless you are good, then you will tie. The computer starts every time, because when I attempted to create the player starts script, it got so big, that Scratch would crash while I was trying to make the script. However, that was in the old scratch engine. With Scratch 2.0, I think I will be able to create an option to allow the player to go first. I am currently in the process of making this update. In the meantime, have fun, report any glitches, and please LOVE-IT!