добавил requirements.txt, config.ini, переработал GameMenu.py

modules/Game.py

@@ -3,11 +3,11 @@ from modules.Board import Board
 
 
 class Game:
-    def __init__(self):
+    def __init__(self, difficulty):
         pygame.init()
         size = 500, 500
         self.screen = pygame.display.set_mode(size)
-        pygame.display.set_caption('Чёрное в белое и наоборот')
+        pygame.display.set_caption(difficulty)
         self.board = Board(5, 7, self.screen)
         self.board.set_view(100, 100, 50)
         self.running = True

modules/GameMenu.py

@@ -1,17 +1,25 @@
-import sys
-from pygame import *
+import pygame
+import pygame_menu
 
 
-def menu():
-    init()
-    DISPLAYPORT = display.set_mode((480, 600))
-    display.set_caption('The Lonely Shooter')
-    background = image.load('styles/background.jpeg').convert()
-    DISPLAYPORT.blit(background, background.get_rect())
-    display.update()
-    while True:
-        events = event.poll()
-        if events.type == KEYDOWN and events.key == K_RETURN:
-            break
-        elif events.type == QUIT:
-            sys.exit()
+def set_difficulty(value, _):
+    global difficulty
+    difficulty = value[0][0]
+
+
+def start_the_game():
+    menu.toggle()
+
+
+difficulty = ""
+pygame.init()
+surface = pygame.display.set_mode((600, 400))
+mytheme = pygame_menu.themes.THEME_DARK.copy()
+mytheme.background_color = pygame_menu.baseimage.BaseImage(image_path='styles/background.jpg')
+menu = pygame_menu.Menu('Welcome', 600, 400, theme=mytheme)
+menu.add.label("Сложность")
+menu.add.selector('', [('Простая', 1), ('Средняя', 2), ('Сложная', 3), ('Проигрывать весело', 4)],
+                  onchange=set_difficulty)
+menu.add.button('Play', start_the_game)
+menu.add.button('Quit', pygame_menu.events.EXIT)
+menu.mainloop(surface)