This document describes the source code for a 3D Tic-Tac-Toe game written in Ring. It includes documentation for classes that handle game logic, graphics, sound, and user interface. The core classes include GameLogic for tracking the game state, GameCube for rendering the game pieces as 3D cubes, GameInterface for user interaction and GameBackground/GameSound for additional elements. The code uses OpenGL and Allegro libraries for 3D rendering and multimedia functionality.