diff --git a/.gitignore b/.gitignore
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+++ b/.gitignore
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+*.o
+*.hi
diff --git a/O.bmp b/O.bmp
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diff --git a/RockPaperScissors.exe b/RockPaperScissors.exe
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diff --git a/RockPaperScissors.hs b/RockPaperScissors.hs
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+-- Putting it all together: Tic Tac Toe
+-- cabal update
+-- cabal install gloss
+-- ghc tictactoe.hs
+-- tictactoe.exe
+
+-- import is just like Java, but you can give modules (akin to Java packages) their own local name
+import qualified Graphics.Gloss.Interface.Pure.Game as Gloss
+import qualified Graphics.Gloss.Data.Bitmap as Bitmap
+import qualified Data.Map as Map
+import Data.List
+
+-- A tic-tac-toe cell is either blank, X, or O
+data Cell = Blank | X | O deriving (Eq, Ord)
+
+-- To encode game state: 
+-- we have the board (a map from a pair of ints to a Cell)
+-- and the current "player" (either X or O)
+data Game = Game {
+    board :: Map.Map (Int, Int) Cell,
+    player :: Cell
+}
+
+-- Initially, the board is a 3x3 grid of blank cells
+initialBoard = Map.fromList [((i,j), Blank) | i <- [0..2], j <- [0..2]]
+
+-- Given a game board, and two coordinates, is the move legit?
+validMove :: Map.Map (Int, Int) Cell -> Int -> Int -> Bool
+validMove board i j
+    | i < 0 || i >= 3 || j < 0 || j >= 3 = False
+    | otherwise = Blank == board Map.! (i,j)
+
+-- X starts the game
+initialGame = Game initialBoard X
+
+-- List the rows in the game board
+rows :: Map.Map (Int, Int) Cell -> [[Cell]]
+rows board = map (map snd) $ groupBy (\((i,j),_) ((k,l),_) -> i == k) $ Map.assocs board
+
+-- List the diagonals in the game board
+diagonals :: Map.Map (Int, Int) Cell -> [[Cell]]
+diagonals board = [[board Map.! (0,0), board Map.! (1,1), board Map.! (2,2)],
+    [board Map.! (2,0), board Map.! (1,1), board Map.! (0,2)]]
+
+
+-- Players switch when taking turns
+switch :: Cell -> Cell
+switch O = X
+switch X = O
+
+-- Given a game board, and a move, get the new game board state
+takeTurn :: Game -> (Int, Int) -> Game
+takeTurn game@Game { board=b, player=p } (i, j)
+    | validMove b i j = newGame
+    | otherwise = game
+ where
+     newGame = Game {
+         board = Map.adjust (\_ -> p) (i,j) b,
+         player = switch p
+    }
+
+-- Did anybody win?
+winner :: Map.Map (Int, Int) Cell -> Bool
+winner board = any win slices
+ where
+    slices = ((rows board) ++ (diagonals board) ++ (transpose $ rows board))
+
+-- Given a slice (row, column, diagonal), are they all the same?
+win slice = foldl1 (\x y -> if x == y then x else Blank) slice /= Blank
+
+-- is the game over? either somebody won, or there's no blanks left
+gameOver :: Map.Map (Int, Int) Cell -> Bool
+gameOver board = winner board  || (not $ any (== Blank) $ Map.elems board)
+
+-- So, who won, if anybody?
+outcome (Game board player)
+    | winner board = switch player
+    | otherwise = Blank
+
+-- Translate mouse clicks (Gloss.Event) into turns
+handleMouse :: Gloss.Event -> Game -> Game
+handleMouse (Gloss.EventKey (Gloss.MouseButton Gloss.LeftButton) Gloss.Down _ (x, y)) game@(Game board player)
+    | gameOver board = game
+    | otherwise = takeTurn game (i, j)
+ where i = round $ (y+160) / 160
+       j = round $ (x+240) / 160
+
+-- don't care about the other events
+handleMouse _ game = game
+
+main = do
+    oPicture <- Bitmap.loadBMP "O.bmp"
+    xPicture <- Bitmap.loadBMP "X.bmp"
+    _Picture <- Bitmap.loadBMP "_.bmp"
+    xwin <- Bitmap.loadBMP "xwin.bmp"
+    owin <- Bitmap.loadBMP "owin.bmp"
+    tie <- Bitmap.loadBMP "tie.bmp"
+    
+    let cellPicture = Map.fromList [(O,oPicture), (X, xPicture), (Blank, _Picture)]
+    let outcomePicture = Map.fromList [(O,owin), (X, xwin), (Blank, tie)]
+    let displayCell (i,j) cell = Gloss.translate ((fromIntegral j :: Float)*160-240) ((fromIntegral i :: Float)*160-160) $ cellPicture Map.! cell
+    let displayBoard (Game board _) = Gloss.Pictures $ Map.elems $ Map.mapWithKey displayCell board
+    let displayOutcome game = Gloss.translate (230) (0) (outcomePicture Map.! (outcome game))
+    let display game@(Game board player) = if gameOver board then Gloss.Pictures [displayOutcome game, displayBoard game] else displayBoard game
+
+    Gloss.play
+        (Gloss.InWindow "Rock Paper Scissors" (1920,1080) (0,0))
+        Gloss.black
+        10
+        initialGame
+        display
+        handleMouse
+        (\f g -> g)
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