We are engineering students in our second year at ESME Sudria Paris and we completed this project in a few working sessions.
This adaptation of the well-known tic-tac-toe game comes in a box containing all the wires, the Arduino board and other cables. On the surface of this box are 9 buttons, on each of which is glued an LED and a small plexiglass circle, allowing the light emitted by the LEDs to be diffused more widely. There's also a 10th button (the red one) that allows you to reset an occurring game.
The code for this game was created using Arduino. It allows each LED to be associated with the button to which it is attached. A game starts when a player touches one of the nine buttons/LEDs, which will light up blue. The LED that the second player touches lights up green, then the first player's LED lights up blue, and so on. When the game has a winner is a tie, simply press the reset button to start a new game.