Simtic allows HUMAN v. CPU play in a game of text-based tic-tac-toe on Linux.
The CPU has 3 difficulty levels, with the hardest difficulty resulting in a full minimax search of all possible game moves. This is possible because the game of tic-tac-toe is simple enough to do a brute-force search of all game scenarios. Any more complicated game would require a search function that continuosly searches for the best move while holding a "best move" candidate at hand (this is how chess engines work).
Use the make command to create a binary using the included Makefile.