diff --git a/assets/Rat/mine.png b/assets/Rat/mine.png
new file mode 100644
index 0000000..2e123cc
Binary files /dev/null and b/assets/Rat/mine.png differ
diff --git a/colorize_assets.py b/colorize_assets.py
new file mode 100644
index 0000000..e69de29
diff --git a/conf/keybinding_game.json b/conf/keybinding_game.json
index f800bbf..f82b282 100644
--- a/conf/keybinding_game.json
+++ b/conf/keybinding_game.json
@@ -9,5 +9,6 @@
     "scroll_left": ["Left", 10],
     "scroll_right": ["Right", 11],
     "spawn_bomb": ["Space", 1],
+    "spawn_mine": ["Left Ctrl", "Control_R", 17],
     "pause": ["P", 16]
 }
\ No newline at end of file
diff --git a/convert_audio.py b/convert_audio.py
new file mode 100644
index 0000000..d9541e2
--- /dev/null
+++ b/convert_audio.py
@@ -0,0 +1,77 @@
+#!/usr/bin/env python3
+"""
+Audio conversion script to convert mine.wav to u8 22100 Hz format
+"""
+
+from pydub import AudioSegment
+import os
+
+def convert_mine_wav():
+    """Convert mine.wav to u8 format at 22100 Hz"""
+    
+    # Input and output paths
+    input_path = "sound/mine.wav"
+    output_path = "sound/mine_converted.wav"
+    
+    if not os.path.exists(input_path):
+        print(f"Error: {input_path} not found!")
+        return
+    
+    try:
+        # Load the audio file
+        print(f"Loading {input_path}...")
+        audio = AudioSegment.from_wav(input_path)
+        
+        # Print current format info
+        print(f"Original format:")
+        print(f"  Sample rate: {audio.frame_rate} Hz")
+        print(f"  Channels: {audio.channels}")
+        print(f"  Sample width: {audio.sample_width} bytes ({audio.sample_width * 8} bits)")
+        print(f"  Duration: {len(audio)} ms")
+        
+        # Convert to mono if stereo
+        if audio.channels > 1:
+            print("Converting to mono...")
+            audio = audio.set_channels(1)
+        
+        # Convert to 22100 Hz sample rate
+        print("Converting sample rate to 22100 Hz...")
+        audio = audio.set_frame_rate(22100)
+        
+        # Convert to 8-bit unsigned (u8)
+        print("Converting to 8-bit unsigned format...")
+        audio = audio.set_sample_width(1)  # 1 byte = 8 bits
+        
+        # Export the converted audio
+        print(f"Saving to {output_path}...")
+        audio.export(output_path, format="wav")
+        
+        # Print new format info
+        converted_audio = AudioSegment.from_wav(output_path)
+        print(f"\nConverted format:")
+        print(f"  Sample rate: {converted_audio.frame_rate} Hz")
+        print(f"  Channels: {converted_audio.channels}")
+        print(f"  Sample width: {converted_audio.sample_width} bytes ({converted_audio.sample_width * 8} bits)")
+        print(f"  Duration: {len(converted_audio)} ms")
+        
+        print(f"\nConversion complete! Output saved as: {output_path}")
+        
+        # Optionally replace the original file
+        replace = input("\nReplace original mine.wav with converted version? (y/n): ").lower()
+        if replace == 'y':
+            import shutil
+            # Backup original
+            backup_path = "sound/mine_original.wav"
+            shutil.copy2(input_path, backup_path)
+            print(f"Original file backed up as: {backup_path}")
+            
+            # Replace original
+            shutil.copy2(output_path, input_path)
+            os.remove(output_path)
+            print(f"Original file replaced with converted version.")
+        
+    except Exception as e:
+        print(f"Error during conversion: {e}")
+
+if __name__ == "__main__":
+    convert_mine_wav()
diff --git a/engine/controls.py b/engine/controls.py
index dcfa30d..64bed6e 100644
--- a/engine/controls.py
+++ b/engine/controls.py
@@ -27,8 +27,9 @@ class KeyBindings:
         elif key in keybindings.get("scroll_right", []):
             self.start_scrolling("Right")
         elif key in keybindings.get("spawn_bomb", []):
-            self.render_engine.play_sound("PUTDOWN.WAV")
             self.spawn_bomb(self.pointer)
+        elif key in keybindings.get("spawn_mine", []):
+            self.spawn_mine(self.pointer)
         elif key in keybindings.get("pause", []):
             self.game_status = "paused" if self.game_status == "game" else "game"
         elif key in keybindings.get("start_game", []):
diff --git a/engine/graphics.py b/engine/graphics.py
index 3c58f49..67170cf 100644
--- a/engine/graphics.py
+++ b/engine/graphics.py
@@ -2,6 +2,7 @@ import os
 
 class Graphics():
     def load_assets(self):
+        print("Loading graphics assets...")
         self.tunnel = self.render_engine.load_image("Rat/BMP_TUNNEL.png", surface=True)
         self.grasses = [self.render_engine.load_image(f"Rat/BMP_1_GRASS_{i+1}.png", surface=True) for i in range(4)]
         self.rat_assets = {}
@@ -16,6 +17,7 @@ class Graphics():
         for file in os.listdir("assets/Rat"):
             if file.endswith(".png"):
                 self.assets[file[:-4]] = self.render_engine.load_image(f"Rat/{file}")
+        
 
 
     # ==================== RENDERING ====================
@@ -65,7 +67,7 @@ class Graphics():
             self.blood_stains[position] = new_blood_surface
         
         # Regenerate background to include the updated blood stain
-        self.regenerate_background()
+        self.background_texture = None
         
     def scroll_cursor(self, x=0, y=0):
         if self.pointer[0] + x > self.map.width or self.pointer[1] + y > self.map.height:
diff --git a/engine/unit_manager.py b/engine/unit_manager.py
index 4b39fe5..c6941d9 100644
--- a/engine/unit_manager.py
+++ b/engine/unit_manager.py
@@ -1,6 +1,6 @@
 import random
 import uuid
-from units import rat, bomb
+from units import rat, bomb, mine
 
 class UnitManager:        
     def count_rats(self):
@@ -17,7 +17,14 @@ class UnitManager:
         self.spawn_unit(rat_class, position)
         
     def spawn_bomb(self, position):
+        self.render_engine.play_sound("PUTDOWN.WAV")
         self.spawn_unit(bomb.Timer, position)
+        
+    def spawn_mine(self, position):
+        if self.map.is_wall(position[0], position[1]):
+            return
+        self.render_engine.play_sound("PUTDOWN.WAV")
+        self.spawn_unit(mine.Mine, position)
 
     def spawn_unit(self, unit, position, **kwargs):
         id = uuid.uuid4()
diff --git a/rats.py b/rats.py
index 05cb85c..e1316ea 100644
--- a/rats.py
+++ b/rats.py
@@ -96,14 +96,14 @@ class MiceMaze(
 
                 
             return True
-        
-        if self.count_rats() > 200:
+        count_rats = self.count_rats()
+        if count_rats > 200:
             self.render_engine.stop_sound()
             self.render_engine.play_sound("WEWIN.WAV")
             self.game_end = (True, False)
             self.game_status = "paused"
             return True
-        if not len(self.units):
+        if not count_rats:
             self.render_engine.stop_sound()
             self.render_engine.play_sound("VICTORY.WAV")
             self.render_engine.play_sound("WELLDONE.WAV", tag="effects")
diff --git a/resize_assets.py b/resize_assets.py
new file mode 100644
index 0000000..d1dc9d3
--- /dev/null
+++ b/resize_assets.py
@@ -0,0 +1,123 @@
+#!/usr/bin/env python3
+"""
+Script to resize PNG asset files to 18x18 pixels and center them on a 20x20 canvas.
+Saves the result back to the same file.
+"""
+
+import os
+import glob
+from PIL import Image, ImageOps
+import argparse
+
+def resize_and_center_image(image_path, target_size=(18, 18), canvas_size=(20, 20)):
+    """
+    Resize an image to target_size and center it on a canvas of canvas_size.
+    
+    Args:
+        image_path (str): Path to the image file
+        target_size (tuple): Size to resize the image to (width, height)
+        canvas_size (tuple): Size of the final canvas (width, height)
+    """
+    try:
+        # Open the image
+        with Image.open(image_path) as img:
+            # Convert to RGBA to handle transparency
+            img = img.convert("RGBA")
+            
+            # Resize the image to target size using high-quality resampling
+            resized_img = img.resize(target_size, Image.Resampling.LANCZOS)
+            
+            # Create a new transparent canvas
+            canvas = Image.new("RGBA", canvas_size, (0, 0, 0, 0))
+            
+            # Calculate position to center the resized image
+            x_offset = (canvas_size[0] - target_size[0]) // 2
+            y_offset = (canvas_size[1] - target_size[1]) // 2
+            
+            # Paste the resized image onto the canvas
+            canvas.paste(resized_img, (x_offset, y_offset), resized_img)
+            
+            # Save back to the same file
+            canvas.save(image_path, "PNG", optimize=True)
+            
+            print(f"✓ Processed: {os.path.basename(image_path)}")
+            
+    except Exception as e:
+        print(f"✗ Error processing {image_path}: {str(e)}")
+
+def process_directory(directory_path, file_pattern="*.png"):
+    """
+    Process all PNG files in a directory.
+    
+    Args:
+        directory_path (str): Path to the directory containing PNG files
+        file_pattern (str): Pattern to match files (default: "*.png")
+    """
+    if not os.path.exists(directory_path):
+        print(f"Error: Directory '{directory_path}' does not exist.")
+        return
+    
+    # Find all PNG files matching the pattern
+    search_pattern = os.path.join(directory_path, file_pattern)
+    png_files = glob.glob(search_pattern)
+    
+    if not png_files:
+        print(f"No PNG files found in '{directory_path}' matching pattern '{file_pattern}'")
+        return
+    
+    print(f"Found {len(png_files)} PNG files to process...")
+    
+    # Process each file
+    for png_file in png_files:
+        resize_and_center_image(png_file)
+    
+    print(f"\nCompleted processing {len(png_files)} files.")
+
+def process_single_file(file_path):
+    """
+    Process a single PNG file.
+    
+    Args:
+        file_path (str): Path to the PNG file
+    """
+    if not os.path.exists(file_path):
+        print(f"Error: File '{file_path}' does not exist.")
+        return
+    
+    if not file_path.lower().endswith('.png'):
+        print(f"Error: File '{file_path}' is not a PNG file.")
+        return
+    
+    print(f"Processing single file: {os.path.basename(file_path)}")
+    resize_and_center_image(file_path)
+    print("Processing complete.")
+
+def main():
+    parser = argparse.ArgumentParser(description="Resize PNG assets to 18x18px and center on 20x20px canvas")
+    parser.add_argument("path", help="Path to PNG file or directory containing PNG files")
+    parser.add_argument("--pattern", default="*.png", help="File pattern to match (default: *.png)")
+    
+    args = parser.parse_args()
+    
+    if os.path.isfile(args.path):
+        process_single_file(args.path)
+    elif os.path.isdir(args.path):
+        process_directory(args.path, args.pattern)
+    else:
+        print(f"Error: '{args.path}' is not a valid file or directory.")
+
+if __name__ == "__main__":
+    # If run without arguments, process the assets/Rat directory by default
+    import sys
+    if len(sys.argv) == 1:
+        # Default to processing the assets/Rat directory
+        script_dir = os.path.dirname(os.path.abspath(__file__))
+        assets_dir = os.path.join(script_dir, "assets", "Rat")
+        if os.path.exists(assets_dir):
+            print("No arguments provided. Processing assets/Rat directory by default...")
+            process_directory(assets_dir)
+        else:
+            print("assets/Rat directory not found. Please provide a path as argument.")
+            print("Usage: python resize_assets.py <path_to_file_or_directory>")
+    else:
+        main()
diff --git a/sound/mine.wav b/sound/mine.wav
new file mode 100644
index 0000000..5fd82a7
Binary files /dev/null and b/sound/mine.wav differ
diff --git a/sound/mine_original.wav b/sound/mine_original.wav
new file mode 100644
index 0000000..b1c0d81
Binary files /dev/null and b/sound/mine_original.wav differ
diff --git a/units/__init__.py b/units/__init__.py
index 6d3e24a..3315cc8 100644
--- a/units/__init__.py
+++ b/units/__init__.py
@@ -6,3 +6,4 @@ from .unit import Unit
 from .rat import Rat, Male, Female
 from .bomb import Bomb, Timer, Explosion
 from .points import Point
+from .mine import Mine
diff --git a/units/mine.py b/units/mine.py
new file mode 100644
index 0000000..d0c380d
--- /dev/null
+++ b/units/mine.py
@@ -0,0 +1,59 @@
+from .unit import Unit
+from .bomb import Explosion
+class Mine(Unit):
+    def __init__(self, game, position=(0,0), id=None):
+        super().__init__(game, position, id)
+        self.speed = 1.0  # Mine doesn't move but needs speed for consistency
+        self.armed = True  # Mine is active and ready to explode
+
+    def move(self):
+        """Mines don't move, but we need to check for collision with rats each frame."""
+        pass
+        
+    def collisions(self):
+        """Check if a rat steps on the mine (has position_before on mine's position)."""
+        if not self.armed:
+            return
+            
+        # Check for rats that have position_before on this mine's position
+        for rat_unit in self.game.unit_positions_before.get(self.position, []):
+            if hasattr(rat_unit, 'sex'):  # Check if it's a rat (rats have sex attribute)
+                # Mine explodes and kills the rat
+                self.explode(rat_unit)
+                break
+                
+    def explode(self, victim_rat):
+        """Mine explodes, killing the rat and destroying itself."""
+        if not self.armed:
+            return
+            
+        print("MINE EXPLOSION!")
+        self.game.render_engine.play_sound("BOMB.WAV")
+
+        # Kill the rat that stepped on the mine
+        if victim_rat.id in self.game.units:
+            victim_rat.die(score=5)
+        
+        # Remove the mine from the game
+        self.die()
+        
+    def draw(self):
+        """Draw the mine using the mine asset."""
+        if not self.armed:
+            return
+            
+        # Use mine asset
+        image = self.game.assets["mine"]
+        image_size = self.game.render_engine.get_image_size(image)
+        
+        # Center the mine in the cell
+        x_pos = self.position[0] * self.game.cell_size + (self.game.cell_size - image_size[0]) // 2
+        y_pos = self.position[1] * self.game.cell_size + (self.game.cell_size - image_size[1]) // 2
+        
+        self.game.render_engine.draw_image(x_pos, y_pos, image, anchor="nw", tag="unit")
+        
+    def die(self, score=None):
+        """Remove mine from game and disarm it."""
+        self.armed = False
+        Explosion(self.game, self.position).draw()
+        super().die(score)