diff --git a/source/core/Board.py b/source/core/Board.py
index 03ad3f3..2a408fa 100644
--- a/source/core/Board.py
+++ b/source/core/Board.py
@@ -3,7 +3,8 @@ import numpy as np
 from source.core.Boat import Boat
 from source.core.enums import Orientation, BombState
 from source.core.error import InvalidBoatPosition, PositionAlreadyShot, InvalidBombPosition
-from source.utils import copy_array_offset, in_bbox
+from source.type import Point2D
+from source.utils import copy_array_offset
 
 
 class Board:
@@ -13,7 +14,7 @@ class Board:
             self,
             width: int,
             height: int = None,
-            boats: dict[Boat, tuple[int, int]] = None,
+            boats: dict[Boat, Point2D] = None,
             bombs: np.array = None
     ) -> None:
 
@@ -21,7 +22,7 @@ class Board:
         self._height: int = width if height is None else height
 
         # associate the boats to their position
-        self._boats: dict[Boat, tuple[int, int]] = {} if boats is None else boats
+        self._boats: dict[Boat, Point2D] = {} if boats is None else boats
 
         # position that have been shot by a bomb
         self._bombs: np.array = np.ones((self._width, self._height), dtype=np.bool_) if bombs is None else bombs
@@ -32,7 +33,7 @@ class Board:
     def __str__(self) -> str:
         return str(self.get_matrice())
 
-    def add_boat(self, boat: Boat, position: tuple[int, int]) -> None:
+    def add_boat(self, boat: Boat, position: Point2D) -> None:
         """
         Add a boat to the board. Check before if the position is valid.
         :boat: the boat to add
@@ -68,7 +69,7 @@ class Board:
         """
         self._boats.pop(boat)
 
-    def bomb(self, position: tuple[int, int]) -> BombState:
+    def bomb(self, position: Point2D) -> BombState:
         """
         Hit a position on the board
         :position: the position where to shoot
diff --git a/source/core/error/InvalidBoatPosition.py b/source/core/error/InvalidBoatPosition.py
index c93772a..14f5894 100644
--- a/source/core/error/InvalidBoatPosition.py
+++ b/source/core/error/InvalidBoatPosition.py
@@ -1,6 +1,7 @@
 from source.core.Boat import Boat
+from source.type import Point2D
 
 
 class InvalidBoatPosition(Exception):
-    def __init__(self, boat: Boat, position: tuple[int, int]):
+    def __init__(self, boat: Boat, position: Point2D):
         super().__init__(f"The boat {boat} can't be placed at {position}.")
diff --git a/source/core/error/InvalidBombPosition.py b/source/core/error/InvalidBombPosition.py
index e1454ef..c961274 100644
--- a/source/core/error/InvalidBombPosition.py
+++ b/source/core/error/InvalidBombPosition.py
@@ -1,3 +1,6 @@
+from source.type import Point2D
+
+
 class InvalidBombPosition(Exception):
-    def __init__(self, position: tuple[int, int]):
+    def __init__(self, position: Point2D):
         super().__init__(f"The bomb can't be placed at {position}.")
diff --git a/source/core/error/PositionAlreadyShot.py b/source/core/error/PositionAlreadyShot.py
index 140525b..2db497c 100644
--- a/source/core/error/PositionAlreadyShot.py
+++ b/source/core/error/PositionAlreadyShot.py
@@ -1,4 +1,7 @@
+from source.type import Point2D
+
+
 class PositionAlreadyShot(Exception):
-    def __init__(self, position: tuple[int, int]):
+    def __init__(self, position: Point2D):
         super().__init__(f"The position {position} have already been shot.")
 
diff --git a/source/gui/scene/MainMenu.py b/source/gui/scene/MainMenu.py
index b2eba66..cbf0fe3 100644
--- a/source/gui/scene/MainMenu.py
+++ b/source/gui/scene/MainMenu.py
@@ -1,5 +1,4 @@
 from source.gui.scene.base import Scene
-from source.gui.widget.Button import Button
 
 from typing import TYPE_CHECKING
 
@@ -11,8 +10,6 @@ class MainMenuScene(Scene):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
 
-        self.add_widget(Button())
-
     def on_draw(self, window: "Window"):
         super().on_draw(window)
 
diff --git a/source/gui/widget/Button.py b/source/gui/widget/Button.py
index bf440bf..cd4ef66 100644
--- a/source/gui/widget/Button.py
+++ b/source/gui/widget/Button.py
@@ -4,6 +4,7 @@ import pyglet
 
 from source.gui.sprite import Sprite
 from source.gui.widget.base import Widget
+from source.type import BBox
 from source.utils import in_bbox
 
 if TYPE_CHECKING:
@@ -81,7 +82,7 @@ class Button(Widget):
         return self._hover_sprite if self._hovering else self._normal_sprite
 
     @property
-    def bbox(self) -> tuple[int, int, int, int]:
+    def bbox(self) -> BBox:
         return self.x, self.y, self.x + self.width, self.y + self.height
 
     # label getter and setter
diff --git a/source/gui/window/Window.py b/source/gui/window/Window.py
index bdfff5a..62f4e2c 100644
--- a/source/gui/window/Window.py
+++ b/source/gui/window/Window.py
@@ -3,7 +3,7 @@ from typing import Optional, Callable, TYPE_CHECKING
 import pyglet.window
 
 if TYPE_CHECKING:
-    from source.gui.scene import Scene
+    from source.gui.scene.base import Scene
 
 
 class Window(pyglet.window.Window):  # NOQA - pycharm think pyglet window is abstract
@@ -15,7 +15,7 @@ class Window(pyglet.window.Window):  # NOQA - pycharm think pyglet window is abs
     putting everything in the window code.
     """
 
-    def __init__(self, scenes: Optional["Scene"] = None, *args, **kwargs):
+    def __init__(self, scenes: Optional[list["Scene"]] = None, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self._scenes: list["Scene"] = []
         if scenes is not None: self.add_scene(*scenes)
diff --git a/source/type.py b/source/type.py
new file mode 100644
index 0000000..e72d125
--- /dev/null
+++ b/source/type.py
@@ -0,0 +1,2 @@
+Point2D = tuple[int, int]
+BBox = tuple[int, int, int, int]
diff --git a/source/utils/copy_array_offset.py b/source/utils/copy_array_offset.py
index 89f609f..5f0ad46 100644
--- a/source/utils/copy_array_offset.py
+++ b/source/utils/copy_array_offset.py
@@ -1,7 +1,9 @@
 import numpy as np
 
+from source.type import Point2D
 
-def copy_array_offset(src: np.array, dst: np.array, offset: tuple[int, int]) -> None:
+
+def copy_array_offset(src: np.array, dst: np.array, offset: Point2D) -> None:
     """
     Copy a numpy array into another one with an offset
     :source: source array
diff --git a/source/utils/in_bbox.py b/source/utils/in_bbox.py
index 0f4e4d2..9eebf9d 100644
--- a/source/utils/in_bbox.py
+++ b/source/utils/in_bbox.py
@@ -1,4 +1,7 @@
-def in_bbox(point: tuple[int, int], bbox: tuple[int, int, int, int]) -> bool:
+from source.type import Point2D, BBox
+
+
+def in_bbox(point: Point2D, bbox: BBox) -> bool:
     """
     Return true if a point is inside a bounding box
     :param point: the point to check