diff --git a/9/Parsing.hs b/9/Parsing.hs
new file mode 100644
index 0000000..8ad0f3f
--- /dev/null
+++ b/9/Parsing.hs
@@ -0,0 +1,23 @@
+module Parsing (
+  splitByString
+  ) where
+
+import           Data.List (isPrefixOf)
+
+splitByString :: String -> String -> [String]
+splitByString _ "" = []
+splitByString splitter string =
+  let (chunk, rest) = spanNextSplit string
+  in
+    chunk:(splitByString splitter rest)
+    where
+      spanNextSplit :: String -> (String, String)
+      spanNextSplit [] = ([], [])
+      spanNextSplit everything@(char:rest)
+        | splitter `isPrefixOf` rest =
+          ([char], (drop ((length splitter) + 1) everything))
+        | otherwise =
+          let
+            (start, end) = spanNextSplit rest
+          in
+            (char:start, end)
diff --git a/9/input.txt b/9/input.txt
new file mode 100644
index 0000000..860ccaa
--- /dev/null
+++ b/9/input.txt
@@ -0,0 +1,100 @@
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diff --git a/9/smokescreen.hs b/9/smokescreen.hs
new file mode 100644
index 0000000..4e10187
--- /dev/null
+++ b/9/smokescreen.hs
@@ -0,0 +1,77 @@
+import           Data.Char (digitToInt)
+import           Data.List (nub, sortBy)
+import           Data.Ord
+
+main :: IO ()
+main = do
+  input <- getContents
+  let
+    heightMap = parseHeights input
+  (putStrLn . show . solution1) heightMap
+  (putStrLn . show . solution2) heightMap
+
+solution1 :: [[Int]] -> Int
+solution1 heights = sum (map (\p -> heights !!! p + 1) (lowPoints heights))
+
+solution2 :: [[Int]] -> Int
+solution2 heights = product (take 3 (sortBy (comparing Down) (map length basins)))
+  where
+    basins :: [[(Int, Int)]]
+    basins = map (flip basin heights) (lowPoints heights)
+
+basin :: (Int, Int) -> [[Int]] -> [(Int, Int)]
+basin point heights
+  | null next = []
+  | otherwise = nub (point:(next)++flatmap (flip basin heights) next)
+    where
+      next = filter partOfBasin (adjacent point heights)
+      partOfBasin x =
+        let
+          xHeight = heights !!! x
+        in
+          xHeight > heights !!! point && xHeight /= 9
+
+flatmap :: (t -> [a]) -> [t] -> [a]
+flatmap _ []     = []
+flatmap f (x:xs) = f x ++ flatmap f xs
+
+lowPoints :: [[Int]] -> [(Int, Int)]
+lowPoints heights = filter (flip isLowPoint heights) (indices heights)
+  where
+    indices :: [[Int]] -> [(Int, Int)]
+    indices m = [(x, y) |
+                  x <- [0..length(m)-1],
+                  y <- [0..length(m !! 0)-1]]
+
+isLowPoint :: (Int, Int) -> [[Int]] -> Bool
+isLowPoint point m = all (> (m !!! point)) (map ((!!!) m) (adjacent point m))
+
+(!!!) :: [[Int]] -> (Int, Int) -> Int
+(!!!) m index = m !! (fst index) !! (snd index)
+
+adjacent :: (Int, Int) -> [[Int]] -> [(Int, Int)]
+adjacent (x, y) m =
+  [(i+x, j+y) |
+    i <- [-1..1],
+    j <- [-1..1],
+    abs i /= abs j,
+    i+x >= 0 && i+x < length(m),
+    j+y >= 0 && j+y < length(m !! 0)]
+
+parseHeights :: String -> [[Int]]
+parseHeights = map (map digitToInt) . lines
+
+-- Tests
+
+testInput = unlines [
+  "2199943210",
+  "3987894921",
+  "9856789892",
+  "8767896789",
+  "9899965678"
+  ]
+
+testInputParsed = parseHeights testInput
+
+test1 = solution1 testInputParsed -- 15
+test2 = solution2 testInputParsed -- 1134