diff --git a/README.md b/README.md
index d6045dc..ed9d7a0 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,6 @@ Contents:
 
 To Do:
 ----------
-- Have specific number of mines, rather than random
+- ~~Have specific number of mines, rather than random~~
 - Highscore table
 - Adjustable grid and mine count via UI
diff --git a/minesweeper.py b/minesweeper.py
index 4c32893..8796195 100644
--- a/minesweeper.py
+++ b/minesweeper.py
@@ -12,6 +12,9 @@
 SIZE_X = 10
 SIZE_Y = 10
 
+FIXED_MINE_NUMBER = True #if True set a fixed number of mines, rather than a random outcome
+MINES_TO_SET = 9
+
 STATE_DEFAULT = 0
 STATE_CLICKED = 1
 STATE_FLAGGED = 2
@@ -61,6 +64,12 @@ def setup(self):
         self.correctFlagCount = 0
         self.clickedCount = 0
         self.startTime = None
+        
+        if FIXED_MINE_NUMBER:
+            #if fixed number, generate random list of mines           
+            #for simplicity generate set of random numbers going up to x*y size
+            #will then compare with mine number, counting across row then row by row
+            mine_list = random.sample(range(SIZE_X*SIZE_Y-1),MINES_TO_SET)
 
         # create buttons
         self.tiles = dict({})
@@ -75,11 +84,19 @@ def setup(self):
 
                 # tile image changeable for debug reasons:
                 gfx = self.images["plain"]
-
-                # currently random amount of mines
-                if random.uniform(0.0, 1.0) < 0.1:
-                    isMine = True
-                    self.mines += 1
+                
+                if FIXED_MINE_NUMBER:
+                    #fixed amount of mines
+                    if x*SIZE_X+y in mine_list:
+                        #count which square number we're on and see if in mine list
+                        isMine = True
+                        self.mines += 1
+                
+                else:
+                    # currently random amount of mines
+                    if random.uniform(0.0, 1.0) < 0.1:
+                        isMine = True
+                        self.mines += 1
 
                 tile = {
                     "id": id,
@@ -130,7 +147,9 @@ def gameOver(self, won):
         if res:
             self.restart()
         else:
-            self.tk.quit()
+            self.tk.destroy() #shut down the window
+            #self.tk.quit()
+            
 
     def updateTimer(self):
         ts = "00:00:00"