diff --git a/constants.py b/constants.py
new file mode 100644
index 0000000..ad1b548
--- /dev/null
+++ b/constants.py
@@ -0,0 +1,2 @@
+# Debug constant. Set to False to turn off debugging messages.
+DEBUG = False
diff --git a/game.py b/game.py
index 74df4c0..e2128c1 100644
--- a/game.py
+++ b/game.py
@@ -13,9 +13,7 @@ from menu import MenuState
 from ingame import InGameState
 from score import ScoreState
 from notvalidstate import NotValidState
-
-# Debug constant. Set to False to turn off debugging messages.
-DEBUG = False
+from constants import DEBUG
 
 # The Game class implements the state machine of the game and
 # runs the main game loop.
diff --git a/intro.py b/intro.py
index fa0c002..4ea2824 100644
--- a/intro.py
+++ b/intro.py
@@ -14,6 +14,7 @@ from state import BaseState, VALID_STATES
 import actor
 import game
 import particle
+from constants import DEBUG
 
 class IntroState(BaseState):
    def __init__(self):
diff --git a/notvalidstate.py b/notvalidstate.py
deleted file mode 100644
index ea9ef74..0000000
--- a/notvalidstate.py
+++ /dev/null
@@ -1,37 +0,0 @@
-# Miguel Angel Astor Romero. Created on 7-1-2013. #
-###################################################
-import pygame
-
-try:
-   import android
-except ImportError:
-   android = None
-
-from state import BaseState, VALID_STATES
-
-class NotValidState(BaseState):
-    def __init__(self):
-       BaseState.__init__(self)
-
-       self.count = 0
-       screen_center = self.get_screen_center()
-       self.rectangle = pygame.Rect(screen_center[0] - 50, screen_center[1] - 50, 100, 100)
-       self.next_transition = VALID_STATES['STAY']
-
-    def input(self):
-       for event in pygame.event.get():
-          if android:
-             if android.check_pause():
-                android.wait_for_resume()
-
-          if event.type == pygame.KEYDOWN:
-             self.next_transition = VALID_STATES['QUIT']
-          if event.type == pygame.QUIT:
-             self.next_transition = VALID_STATES['QUIT']
-
-    def update(self):
-       return self.next_transition
-
-    def render(self, canvas):
-       canvas.fill(self.background_color)
-       pygame.draw.rect(canvas, (0, 0, 0), self.rectangle)