Yeah, I made this yesterday, so I guess this is my first completed game made in C++:
TIC-TAC-TOE

You can download it here:
Tic Tac Toe (release).7z (7-zip format) – 1.28MB
How to play:
It’s pretty straightforward, just click on the grid to place X’s and O’s. Sorry, there’s no single player mode, so you’ll have to come out of your cave and actually talk to someone.
In developing this, I used the following libraries: