diff --git a/mine_models/__init__.py b/mine_models/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/mine_models/mine.py b/mine_models/mine.py
index 7e9dcb3..82071c4 100644
--- a/mine_models/mine.py
+++ b/mine_models/mine.py
@@ -1,11 +1,11 @@
-# module for abstarct classes
+# module for abstract classes
 from abc import ABC, abstractmethod
 
 # type hints
 from typing import Tuple
 
-# Mine cannot be instatinated
-# all abstarct methods must be implemented in derived classes
+# Mine cannot be instantiated
+# all abstract methods must be implemented in derived classes
 
 
 class Mine(ABC):
diff --git a/minefield.py b/minefield.py
index 4b431dc..b994ee7 100644
--- a/minefield.py
+++ b/minefield.py
@@ -1,5 +1,5 @@
 import json
-import ctypes   #
+import ctypes
 import agent as ag
 import project_constants as const
 import tile as tl
diff --git a/project_constants.py b/project_constants.py
index 49d987c..828a2f7 100644
--- a/project_constants.py
+++ b/project_constants.py
@@ -19,8 +19,8 @@ V_FPS = 60
 V_TILE_SIZE = 60
 V_GRID_VER_TILES = V_GRID_HOR_TILES = 10  # vertical (number of rows), horizontal (number of columns)
 V_SCREEN_PADDING = 10
-V_MINEFIELD_HEIGHT = V_TILE_SIZE * V_GRID_VER_TILES
-V_MINEFIELD_WIDTH = V_TILE_SIZE * V_GRID_HOR_TILES
+V_WINDOW_HEIGHT = V_TILE_SIZE * V_GRID_VER_TILES
+V_WINDOW_WIDTH = V_TILE_SIZE * V_GRID_HOR_TILES
 
 SCREEN = pygame.display.set_mode(
     (
@@ -71,6 +71,7 @@ STRUCT_MINE_ATTRIBUTES = {
 # used for random mine generation
 # int - integral number
 # (int, int) - index "row,column" where row=int and column=int (used exclusively for chained mine)
+
 STRUCT_MINE_ATTRIBUTE_TYPES = {
     "standard": [],
     "chained": [],
@@ -80,19 +81,26 @@ STRUCT_MINE_ATTRIBUTE_TYPES = {
 # ============== #
 # ==== MAPS ==== #
 # ============== #
+
 MAP_RANDOM_10x10 = os.path.join("resources", "minefields", "secondmap.json")
 
+
 # ============== #
 # === ASSETS === #
 # ============== #
 
 ASSET_BACKGROUND = pygame.transform.scale(
     pygame.image.load(os.path.join(ASSETS_DIR, "new_grid.png")),
-    (V_MINEFIELD_WIDTH, V_MINEFIELD_WIDTH)
+    (V_WINDOW_WIDTH, V_WINDOW_WIDTH)
 )
 
 ASSET_SAPPER = pygame.transform.scale(
-    pygame.image.load(os.path.join(ASSETS_DIR, "sapper.png")),
+    pygame.image.load(os.path.join(ASSETS_DIR, "robot_sapper.png")),
+    (V_TILE_SIZE, V_TILE_SIZE)
+)
+
+ASSET_WALL = pygame.transform.scale(
+    pygame.image.load(os.path.join(ASSETS_DIR, "brick_wall.png")),
     (V_TILE_SIZE, V_TILE_SIZE)
 )
 
diff --git a/resources/assets/brick_wall.png b/resources/assets/brick_wall.png
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diff --git a/resources/assets/blue_tile.png b/resources/assets/first assets/blue_tile.png
similarity index 100%
rename from resources/assets/blue_tile.png
rename to resources/assets/first assets/blue_tile.png
diff --git a/resources/assets/green_tile.png b/resources/assets/first assets/green_tile.png
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rename from resources/assets/green_tile.png
rename to resources/assets/first assets/green_tile.png
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rename from resources/assets/grid.png
rename to resources/assets/first assets/grid.png
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rename from resources/assets/hex_mine.png
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rename from resources/assets/pen_mine.png
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rename from resources/assets/white_tile.png
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