Here is a list of all files with brief descriptions:

[detail level 12]

tests
ball_test.cpp	Test suite for the Ball classes functionality
letter_test.cpp	Test suite for the Letter class functionality
paddle_test.cpp	Test suite for the Paddle class functionality
user_test.cpp	Test suite for the User class functionality
ai.cpp	Implementation of the AI class for computer-controlled paddle
ai.hpp	Header defining the AI class for computer-controlled paddle
ball_base.cpp	Implementation of the BallBase class
ball_base.hpp	Base class for all ball types in the game
classic_ball.cpp	Implementation of the classic circular ball ClassicBall class
classic_ball.hpp	Header defining the classic circular ball ClassicBall class
game.cpp
game.hpp
game_over.cpp	Implementation of the game_over screen class
game_over.hpp	Header defining the game_over screen class
game_save.cpp	Implementation of save game functionality for Saving class
game_save.hpp	Header defining the save game and highscore functionaloty from the Saving class
gui.cpp	Implementation of the GUI class for game interface
gui.hpp	Header defining the GUI utility class for game interface
inverse_power.cpp	Header defining the InversiblePower class for paddles' temporary arrows control effect
inverse_power.hpp	Implementation of the InversiblePower class
invisible_power.cpp	Implementation of the InvisiblePower class
invisible_power.hpp	Header defining the InvisiblePower class for ball visibility effects
letter.cpp	Implementation of the Letter class
letter.hpp	Header defining the Letter class for story mode
macros.hpp	Defines macros and constants used throughout the project
main.cpp	Main entry point for the Pong game
network.cpp
network.hpp
paddle.cpp	Implementation of the Paddle class for the game
paddle.hpp	Header defining the Paddle class for the game
page_2b_1t.cpp	Implementation of the notice screen page_2b_1t class
page_2b_1t.hpp	Header defining the notice screen page_2b_1t class
page_3b.cpp	Implementation of the pause menu page_3b class
page_3b.hpp	Header defining the pause menu page_3b class
page_3b_0t.cpp	Implementation of the main menu page_3b_0t class
page_3b_0t.hpp	Header defining the main menu class with 3 buttons and no title of the page_3b_0t class
page_3b_1t.cpp	Implementation of the middle menu page_3b_1t class
page_3b_1t.hpp	Header defining the middle menu class with 3 buttons and 1 title of page_3b_1t class
page_4b_1t.cpp	Implementation of the mode selection menu page_4b_1t class
page_4b_1t.hpp	Header defining the mode selection menu page_4b_1t class
power.cpp	Implementation of the Power class for special game effects
power.hpp	Header defining the Power class for special game effects
renderers.cpp	Implementation of rendering functions for various game shapes
renderers.hpp	Header defining renderers for various game shapes
sound_effects.cpp	Implementation of the SoundEffects utility class
sound_effects.hpp	Header defining the SoundEffects utility class
square_ball.cpp	Implementation of the SquareBall class
square_ball.hpp	Header defining the SquareBall class
triangle_ball.cpp	Implementation of the TriangleBall class
triangle_ball.hpp	Header defining the TriangleBall class
user.cpp	Implementation of the User class for player management
user.hpp	Header defining the User class for player management