diff --git a/src/Minesweeper.hs b/src/Minesweeper.hs
index 98dc523..2fec3c1 100644
--- a/src/Minesweeper.hs
+++ b/src/Minesweeper.hs
@@ -13,11 +13,11 @@ data Board = Board { size :: Int
 
 -- Creates a board given a size (width/height), mine ratio and random generator
 createBoard :: Int -> Float -> StdGen -> Board
-createBoard size mineRatio rng = Board size (seedGrid rng mineRatio (createGrid size)) (createGrid size) (createGrid size)
+createBoard size mineRatio rng = Board size (seedGrid rng mineRatio (createGrid False size)) (createGrid False size) (createGrid False size)
 
--- Creates a 2D list of booleans of given size, initialised to False
-createGrid :: Int -> Grid
-createGrid size = replicate size (replicate size False)
+-- Creates a 2D list of booleans of given size, initialised to given boolean
+createGrid :: Bool -> Int -> Grid
+createGrid b size = replicate size (replicate size b)
 
 -- Functions relating to seeding a grid with mines
 
@@ -105,6 +105,8 @@ boolToInt x | x = 1
 uncover :: Board -> Square -> Board
 uncover b (r,c) | not $ validSquare b (r,c) = b
                 | isUncovered b (r,c) = b
+                | hasMine b (r,c) = let Board s m u f = b
+                                    in Board s m (createGrid True s) f
                 | otherwise = let Board s m u f = b
                                   (rowsA, row : rowsB) = splitAt r u
                                   (cellsA, _ : cellsB) = splitAt c row