diff --git a/src/py2048/block.py b/src/py2048/block.py
index 354228a..823ad86 100644
--- a/src/py2048/block.py
+++ b/src/py2048/block.py
@@ -17,14 +17,14 @@ class Block(pygame.sprite.Sprite):
         self.font = pygame.font.SysFont(Config.FONT_FAMILY, Config.FONT_SIZE)
         self.update()
 
-    def draw_value(self) -> None:
+    def _draw_value(self) -> None:
         """Draw the value of the block"""
         text = self.font.render(str(self.value), True, COLORS.FG)
         text_rect = text.get_rect(center=self.image.get_rect().center)
         self.image.blit(text, text_rect)
 
     def move(self, dx: int, dy: int) -> None:
-        """Move the block by `dx` and `dy`"""
+        """Move the block by `dx` and `dy`."""
         new_x = self.rect.x + dx
         new_y = self.rect.y + dy
         if 0 <= new_x <= Config.WIDTH - Config.BLOCK_SIZE and 0 <= new_y <= Config.HEIGHT - Config.BLOCK_SIZE:
@@ -38,10 +38,10 @@ class Block(pygame.sprite.Sprite):
 
     def update(self) -> None:
         """Update the block"""
-        self.change_color()
-        self.draw_value()
+        self._change_color()
+        self._draw_value()
 
-    def change_color(self) -> None:
+    def _change_color(self) -> None:
         """Change the color of the block based on its value"""
         color_map = {
             2: COLORS.BLUE,
diff --git a/src/py2048/game.py b/src/py2048/game.py
index 963f4b3..c75e01d 100644
--- a/src/py2048/game.py
+++ b/src/py2048/game.py
@@ -19,26 +19,26 @@ class Game:
         self.screen: pygame.Surface = pygame.display.set_mode((Config.WIDTH, Config.HEIGHT))
         pygame.display.set_caption("2048")
         self.sprites = pygame.sprite.Group()
-        self.generate_random_block(Config.INITIAL_BLOCK_COUNT)
+        self._generate_random_block(Config.INITIAL_BLOCK_COUNT)
 
     def run(self) -> None:
         """Run the game loop."""
         while True:
-            self.hande_events()
-            self.update()
-            self.render()
+            self._hande_events()
+            self._update()
+            self._render()
 
-    def update(self) -> None:
+    def _update(self) -> None:
         """Update the game."""
         self.sprites.update()
 
-    def render(self) -> None:
+    def _render(self) -> None:
         """Render the game."""
         self.screen.fill(COLORS.BG)
         self.sprites.draw(self.screen)
         pygame.display.flip()
 
-    def hande_events(self) -> None:
+    def _hande_events(self) -> None:
         """Handle pygame events."""
         for event in pygame.event.get():
             if event.type == pygame.QUIT:
@@ -90,9 +90,9 @@ class Game:
                     block.increase_value()
                     self.sprites.remove(other_block)
                     moved_blocks.add(block)
-        self.generate_random_block()
+        self._generate_random_block()
 
-    def generate_random_block(self, count: int = 1) -> None:
+    def _generate_random_block(self, count: int = 1) -> None:
         """Generate `count` number of random blocks."""
         for _ in range(count):
             while True: