Few years ago I was trying to get a job as a game developer. My test task was to make the Tic Tac Toe game using Unity3D game engine.
I didn't get the job but the game worked and looked good. Moreover my C# source code of Tic Tac Toe game is simple and well commented.
So I decided to publish the Tic-Tac-Toe project on GitHub.
Hope the sources of this game project for Unity3D will be a useful tutorial for some game developer or other person who want to learn the programming. Enjoy :)