diff --git a/assets/img/long_splash_after.png b/assets/img/long_splash_after.png
new file mode 100644
index 0000000..f4e41f0
Binary files /dev/null and b/assets/img/long_splash_after.png differ
diff --git a/assets/img/map_long.png b/assets/img/map_long.png
new file mode 100644
index 0000000..928c22d
Binary files /dev/null and b/assets/img/map_long.png differ
diff --git a/octops.py b/octops.py
index 16dd0f6..b262118 100644
--- a/octops.py
+++ b/octops.py
@@ -28,6 +28,7 @@
 from screens.doors import DoorsScreen
 from screens.spawn import SpawnScreen
 from screens.map import MapScreen
+from screens.long import LongScreen
 
 #--------------------------App--------------------------#
 
@@ -45,6 +46,7 @@ def build(self):
         sm.add_widget(SiteAScreen(name='sitea'))
         sm.add_widget(DoorsScreen(name='doors'))
         sm.add_widget(SpawnScreen(name='spawn'))
+        sm.add_widget(LongScreen(name='long'))
 
         return sm
     
diff --git a/screenLayout/long_screen.kv b/screenLayout/long_screen.kv
new file mode 100644
index 0000000..fe5b9b8
--- /dev/null
+++ b/screenLayout/long_screen.kv
@@ -0,0 +1,234 @@
+<LongScreen>:
+    FloatLayout:
+        # Initialize background splash image
+        BoxLayout:
+            id: splash_bg
+            opacity: 1
+            AsyncImage:
+                source: 'assets/img/long_splash_after.png'
+                allow_stretch: True
+                keep_ratio: False
+                size_hint: 1, 1
+
+        # Initialize a matrix of 3x3 buttons each with unique id, text and position
+        Button:
+            id: 1
+            text: "e"
+            font_size: "30sp"
+            color: 255,255,255
+            halign: 'center'
+            valign: 'bottom'
+            background_color: 255,255,255
+            size_hint: None,None
+            size: dp(30), dp(30)
+            pos: dp(100), dp(300)
+            disabled: True if splash_bg_after.opacity == 1 else False # Ensure buttons stay enabled until puzzle is solved
+            on_press:
+                root.change_img(self, 1) # Call function to toggle button image from grey to green upon press
+                root.check_product(self, 1) # Call function to check whether correct combination entered or not
+
+            Image:
+                id: 1
+                source: 'assets/img/symbols/off.png' # Initialize each button with a grey (off) image
+                center_x: self.parent.center_x
+                center_y: self.parent.top - 10
+
+        Button:
+            id: 2
+            text: "e"
+            font_size: "30sp"
+            color: 255,255,255
+            halign: 'center'
+            valign: 'bottom'
+            background_color: 255,255,255
+            size_hint: None,None
+            size: dp(30), dp(30)
+            pos: dp(521), dp(467)
+            disabled: True if splash_bg_after.opacity == 1 else False
+            on_press:
+                root.change_img(self, 2)
+                root.check_product(self, 2)
+
+            Image:
+                id: 2
+                source: 'assets/img/symbols/off.png'
+                center_x: self.parent.center_x
+                center_y: self.parent.top - 10
+
+        Button:
+            id: 3
+            text: "a"
+            font_size: "30sp"
+            color: 255,255,255
+            halign: 'center'
+            valign: 'bottom'
+            background_color: 255,255,255
+            size_hint: None,None
+            size: dp(30), dp(30)
+            pos: dp(475), dp(347)
+            disabled: True if splash_bg_after.opacity == 1 else False
+            on_press:
+                root.change_img(self, 3)
+                root.check_product(self, 3)
+
+            Image:
+                id: 3
+                source: 'assets/img/symbols/off.png'
+                center_x: self.parent.center_x
+                center_y: self.parent.top - 10
+
+        Button:
+            id: 4
+            text: "a"
+            font_size: "30sp"
+            color: 255,255,255
+            halign: 'center'
+            valign: 'bottom'
+            background_color: 255,255,255
+            size_hint: None,None
+            size: dp(30), dp(30)
+            pos: dp(148), dp(372)
+            disabled: True if splash_bg_after.opacity == 1 else False
+            on_press:
+                root.change_img(self, 4)
+                root.check_product(self, 4)
+
+            Image:
+                id: 4
+                source: 'assets/img/symbols/off.png'
+                center_x: self.parent.center_x
+                center_y: self.parent.top - 10
+
+        Button:
+            id: 5
+            text: "e"
+            font_size: "30sp"
+            color: 255,255,255
+            halign: 'center'
+            valign: 'bottom'
+            background_color: 255,255,255
+            size_hint: None,None
+            size: dp(30), dp(30)
+            pos: dp(261), dp(102)
+            disabled: True if splash_bg_after.opacity == 1 else False
+            on_press:
+                root.change_img(self, 5)
+                root.check_product(self, 5)
+
+            Image:
+                id: 5
+                source: 'assets/img/symbols/off.png'
+                center_x: self.parent.center_x
+                center_y: self.parent.top - 10
+
+        Button:
+            id: 6
+            text: "a"
+            font_size: "30sp"
+            color: 255,255,255
+            halign: 'center'
+            valign: 'bottom'
+            background_color: 255,255,255
+            size_hint: None,None
+            size: dp(30), dp(30)
+            pos: dp(525), dp(242)
+            disabled: True if splash_bg_after.opacity == 1 else False
+            on_press:
+                root.change_img(self, 6)
+                root.check_product(self, 6)
+
+            Image:
+                id: 6
+                source: 'assets/img/symbols/off.png'
+                center_x: self.parent.center_x
+                center_y: self.parent.top - 10
+
+        Button:
+            id: 7
+            text: "e"
+            font_size: "30sp"
+            color: 255,255,255
+            halign: 'center'
+            valign: 'bottom'
+            background_color: 255,255,255
+            size_hint: None,None
+            size: dp(30), dp(30)
+            pos: dp(148), dp(37)
+            disabled: True if splash_bg_after.opacity == 1 else False
+            on_press:
+                root.change_img(self, 7)
+                root.check_product(self, 7)
+
+            Image:
+                id: 7
+                source: 'assets/img/symbols/off.png'
+                center_x: self.parent.center_x
+                center_y: self.parent.top - 10
+
+        Button:
+            id: 8
+            text: "a"
+            font_size: "30sp"
+            color: 255,255,255
+            halign: 'center'
+            valign: 'bottom'
+            background_color: 255,255,255
+            size_hint: None,None
+            size: dp(30), dp(30)
+            pos: dp(261), dp(337)
+            disabled: True if splash_bg_after.opacity == 1 else False
+            on_press:
+                root.change_img(self, 8)
+                root.check_product(self, 8)
+
+            Image:
+                id: 8
+                source: 'assets/img/symbols/off.png'
+                center_x: self.parent.center_x
+                center_y: self.parent.top - 10
+
+        Button:
+            id: 9
+            text: "a"
+            font_size: "30sp"
+            color: 255,255,255
+            halign: 'center'
+            valign: 'bottom'
+            background_color: 255,255,255
+            size_hint: None,None
+            size: dp(30), dp(30)
+            pos: dp(375), dp(237)
+            disabled: True if splash_bg_after.opacity == 1 else False
+            on_press:
+                root.change_img(self, 9)
+                root.check_product(self, 9)
+
+            Image:
+                id: 9
+                source: 'assets/img/symbols/off.png'
+                center_x: self.parent.center_x
+                center_y: self.parent.top - 10
+
+        # Initialize background image to be switched to on correct combination
+        BoxLayout:
+            id: splash_bg_after
+            orientation: 'vertical'
+            opacity: 0
+            AsyncImage:
+                source: 'assets/img/long_splash_after.png'
+                allow_stretch: True
+                keep_ratio: False
+                size_hint: 1, 1
+
+        # Initialize return button to map window
+        Button:
+            size_hint: None,None
+            size: dp(60), dp(60)
+            pos: dp(12), dp(523)
+            background_color: 0,0,0,0
+            on_press: root.manager.current = 'map'
+
+            Image:
+                source: 'assets/img/button_return.png'
+                center_x: self.parent.center_x
+                center_y: self.parent.center_y
diff --git a/screenLayout/map_screen.kv b/screenLayout/map_screen.kv
index 0f78f08..7114ff6 100644
--- a/screenLayout/map_screen.kv
+++ b/screenLayout/map_screen.kv
@@ -48,6 +48,21 @@
                 center_x: self.parent.center_x
                 center_y: self.parent.center_y
 
+        #long
+        Button:
+            size_hint: None,None
+            size: dp(135), dp(135)
+            pos: dp(430), dp(225)
+            background_color: 0,0,0,0
+            on_press: root.manager.current = 'long'
+
+            Image:
+                source: 'assets/img/map_long.png'
+                size_hint: (1, 1)
+                size: dp(120), dp(120)
+                center_x: self.parent.center_x
+                center_y: self.parent.center_y
+
         #doors
         Button:
             size_hint: None,None
diff --git a/screenLayout/sitea_screen.kv b/screenLayout/sitea_screen.kv
index 188812c..764eb58 100644
--- a/screenLayout/sitea_screen.kv
+++ b/screenLayout/sitea_screen.kv
@@ -44,10 +44,10 @@
             size_hint: None,None
             size: dp(80), dp(80)
             pos: dp(261), dp(347)
-            disabled: True
-
-
-
+            disabled: True if splash_bg_after.opacity == 1 else False
+            on_press:
+                root.change_img(self, 2) # Call function to toggle button image from grey to green upon press
+                root.check_product(self, 2) # Call function to check whether correct combination entered or not
 
             Image:
                 id: 2
@@ -112,8 +112,8 @@
             pos: dp(261), dp(242)
             disabled: True if splash_bg_after.opacity == 1 else False
             on_press:
-                root.change_img(self, 4)
-                root.check_product(self, 4)
+                root.change_img(self, 5)
+                root.check_product(self, 5)
 
             Image:
                 id: 5
diff --git a/screens/doors.py b/screens/doors.py
index f75985c..d39a898 100644
--- a/screens/doors.py
+++ b/screens/doors.py
@@ -9,25 +9,31 @@
 class DoorsScreen(Screen):
     verified = False
 
+    # This method checks if the current value of the label is 9, if it is, then it sets the value of the label to 0.
     def increment_value(self, label_index):
-        if(int(label_index.text) == 5):
+        if(int(label_index.text) == 9):
             label_index.text = "0"
         else:
             label_index.text = f"{int(label_index.text) + 1}"
+        # After every decrement, checks if the resulting passcode is correct or not.
         DoorsScreen.verify(self)
 
+    # This method checks if the current value of the label is 0, if it is, then it sets the value of the label to 9.
     def decrement_value(self, label_index):
         if(int(label_index.text) == 0):
             label_index.text = "5"
         else:
             label_index.text = f"{int(label_index.text) - 1}"
+        # After every decrement, checks if the resulting passcode is correct or not.
         DoorsScreen.verify(self)
 
+    # First checks if the passcode entered is correct. Its calculated by concatenating the text values of four label objects.
     def verify(self):
         code = passcode == int(self.ids.label_1.text + self.ids.label_2.text + self.ids.label_3.text + self.ids.label_4.text)
+        # If the passcode is correct, then DoorsScreen.verify is set True.
         if not DoorsScreen.verified and code:
             DoorsScreen.verified = True
-            self.ids.splash_bg.opacity = 0
-            self.ids.splash_bg_after.opacity = 1
-            set_doors()
-            sound.play()
\ No newline at end of file
+            self.ids.splash_bg.opacity = 0      # background splash image is faded out
+            self.ids.splash_bg_after.opacity = 1        # background splash image after is faded in.
+            set_doors()     # set_doors() is called indicating the level is cleared.
+            sound.play()    # sound is played.
\ No newline at end of file
diff --git a/screens/long.py b/screens/long.py
new file mode 100644
index 0000000..abdbf82
--- /dev/null
+++ b/screens/long.py
@@ -0,0 +1,44 @@
+from kivy.lang import Builder
+from kivy.uix.screenmanager import Screen
+from kivy.core.audio import SoundLoader
+
+from .screen_check import set_long
+
+# Import and load .kv file containing widget and layout info along with audio files to be played in the window
+Builder.load_file('screenLayout/long_screen.kv')
+sound = SoundLoader.load('assets/audio/sitea_planted.wav')
+class LongScreen(Screen):
+    pressed_buttons = []
+
+    def show_overlay(self):  # Updating the window state after correct combination
+        self.ids.splash_bg.opacity = 0
+        self.ids.splash_bg_after.opacity = 1
+        self.pressed_buttons = []
+
+    def change_img(self, button, idOG):  # Toggle the button states to on(green)/off(grey) on press
+        idOG_dynamic = f"{idOG}"
+        widget = getattr(self.ids, idOG_dynamic, None)
+        widget.source = "assets/img/symbols/on.png" if widget.source == "assets/img/symbols/off.png" else "assets/img/symbols/on.png"
+
+    def check_product(self, instance, id):  # Check for correct code combination
+        button_id = id
+        self.pressed_buttons.append(id)
+        x = ""
+        if len(self.pressed_buttons) == 4:  # Check every 4 button press
+            product = 1
+            for button_id in self.pressed_buttons:
+                product *= button_id
+
+            if product == 70:  # Check whether correct combination is entered
+                x = "Valid"
+                sound.play()
+                self.show_overlay()
+                set_long()  # Update global long flag variable
+            else:
+                x = "Invalid"
+
+        if x == "Invalid":  # Toggle all on(green) button states to off(grey) and clear all previous entries
+            for button in self.pressed_buttons:
+                widget = getattr(self.ids, f"{button}", None)
+                widget.source = "assets/img/symbols/off.png"
+            self.pressed_buttons = []
diff --git a/screens/screen_check.py b/screens/screen_check.py
index a449f24..2abf083 100644
--- a/screens/screen_check.py
+++ b/screens/screen_check.py
@@ -1,6 +1,7 @@
 devMode = False
 
 sitea = devMode
+long = devMode
 doors = devMode
 spawn = devMode
 passcode = 1275 #linked to bomb hints png
@@ -14,6 +15,13 @@ def set_sitea():
 def get_sitea():
     return sitea
 
+def set_long():
+    global long
+    long = not long
+
+def get_long():
+    return long
+
 def set_doors():
     global doors
     doors = not doors
diff --git a/screens/siteA.py b/screens/siteA.py
index b310bca..30e2254 100644
--- a/screens/siteA.py
+++ b/screens/siteA.py
@@ -18,7 +18,7 @@ def show_overlay(self):  # Updating the window state after correct combination
     def change_img(self, button, idOG):  # Toggle the button states to on(green)/off(grey) on press
         idOG_dynamic = f"{idOG}"
         widget = getattr(self.ids, idOG_dynamic, None)
-        widget.source = "assets/img/symbols/off.png" if widget.source == "assets/img/symbols/off.png" else "assets/img/symbols/off.png"
+        widget.source = "assets/img/symbols/on.png" if widget.source == "assets/img/symbols/off.png" else "assets/img/symbols/on.png"
 
     def check_product(self, instance, id):  # Check for correct code combination
         button_id = id
diff --git a/screens/siteB.py b/screens/siteB.py
index 3704ba4..c687fbc 100644
--- a/screens/siteB.py
+++ b/screens/siteB.py
@@ -5,7 +5,7 @@
 from kivy.uix.screenmanager import Screen
 from kivy.core.audio import SoundLoader
 
-from .screen_check import passcode, get_spawn, get_doors, get_sitea, get_time
+from .screen_check import passcode, get_spawn, get_doors, get_sitea, get_long, get_time
 from .map import MapScreen
 
 Builder.load_file('screenLayout/siteb_screen.kv')
@@ -20,18 +20,18 @@ def Delay(delay):
         return Animation(duration=delay)
 
     def on_enter(self):
-        if not SiteBScreen.visited and not (get_spawn() and get_sitea() and get_doors()):
+        if not SiteBScreen.visited and not (get_spawn() and get_sitea() and get_doors() and get_long()):
             SiteBScreen.visited = True
             octocat_icon = self.Delay(0.5) + Animation(color=(1,1,1,1), pos= (dp(0), dp(0)), duration=0.2, t='out_quad') + self.Delay(3.5) + Animation(color=(1,1,1,0), duration=0.2, t='out_quad')
             octocat_icon.start(self.ids.octocat_icon)
             text_bubble = self.Delay(1) + Animation(color=(1,1,1,1), pos = (dp(233), dp(155)), duration=0.2, t='out_quad') + self.Delay(3.5) + Animation(color=(1,1,1,0), pos = (dp(233), dp(155)), duration=0.2, t='out_quad')
             text_bubble.start(self.ids.octocat_hint)
 
-        if get_spawn() and get_sitea() and get_doors() and not SiteBScreen.defused:
+        if get_spawn() and get_sitea() and get_doors() and get_long() and not SiteBScreen.defused:
             self.ids.defuse_img.color = (1,1,1,1)
 
     def defuse_btn_press(self):
-        if get_sitea() and get_doors() and get_spawn() and not SiteBScreen.defused:
+        if get_sitea() and get_doors() and get_spawn() and get_long() and not SiteBScreen.defused:
             SiteBScreen.defused = True
             MapScreen.stop_timer(self)
             Animation(color= (1,1,1,0.5), duration=0.5).start(self.ids.defuse_img)
diff --git a/screens/spawn.py b/screens/spawn.py
index f770ff0..5762717 100644
--- a/screens/spawn.py
+++ b/screens/spawn.py
@@ -10,7 +10,7 @@ class SpawnScreen(Screen):
     verified = False
 
     def slider_val_change(self):
-        if not SpawnScreen.verified and ((self.ids.slide1.value < slider[0]+5) and (self.ids.slide1.value > slider[0]-5 )) and ((self.ids.slide2.value < slider[2]+5)and ( self.ids.slide2.value > slider[2]-5 )) and ((self.ids.slide3.value < slider[2]+5) and (self.ids.slide3.value > slider[2]-5 )):
+        if not SpawnScreen.verified and ((self.ids.slide1.value < slider[0]+5) and (self.ids.slide1.value > slider[0]-5 )) and ((self.ids.slide2.value < slider[1]+5)and ( self.ids.slide2.value > slider[1]-5 )) and ((self.ids.slide3.value < slider[2]+5) and (self.ids.slide3.value > slider[2]-5 )):
             SpawnScreen.verified = True
             self.ids.splash_bg.opacity = 0
             self.ids.splash_bg_after.opacity = 1