diff --git a/09/Main.idr b/09/Main.idr
new file mode 100644
index 0000000..cc992c2
--- /dev/null
+++ b/09/Main.idr
@@ -0,0 +1,159 @@
+import Data.String
+import Data.Vect
+import Data.List1
+import System.File.ReadWrite
+
+%default total
+
+data Direction = Up | Right | Left | Down
+%name Direction direction, direction2, direction3
+
+Show Direction where
+  show Up = "Up"
+  show Right = "Right"
+  show Left = "Left"
+  show Down = "Down"
+
+parseDirection : String -> Maybe Direction
+parseDirection input =
+  case trim input of
+    "U" => Just Up
+    "R" => Just Right
+    "L" => Just Left
+    "D" => Just Down
+    x => Nothing
+
+invert : Direction -> Direction
+invert Up = Down
+invert Right = Left
+invert Left = Right
+invert Down = Up
+
+-- Apply a direction to a pair of Ints
+applyDirection : Direction -> (Int, Int) -> (Int, Int)
+applyDirection Up (x, y) = (x, y + 1)
+applyDirection Right (x, y) = (x + 1, y)
+applyDirection Left (x, y) = (x - 1, y)
+applyDirection Down (x, y) = (x, y - 1)
+
+data Motion = Move Direction Nat
+%name Motion motion, motion2, motion3
+
+Show Motion where
+  show (Move direction count) = show direction ++ " " ++ show count
+
+parseMotion : String -> Maybe Motion
+parseMotion input =
+  let components = split (== ' ') input in
+    case forget components of
+      [x, y] => do direction <- parseDirection x
+                   ammount <- parsePositive y
+                   pure (Move direction ammount)
+      _ => Nothing
+
+parseMotions : String -> Maybe (List Motion)
+parseMotions input =
+  let inputLines = lines input
+  in traverse parseMotion inputLines
+
+-- Get the distance moved by a motion
+distance : Motion -> Nat
+distance (Move _ i) = i
+
+-- Break a motion down into a list of moves-by-one
+breakdown : (motion : Motion) -> Vect (distance motion) Direction
+breakdown (Move direction 0) = []
+breakdown input@(Move direction (S k)) = direction :: breakdown (assert_smaller input (Move direction k))
+
+-- The state of a head and tail
+data State: Type where
+  MkState : (head : (Int, Int)) -> (tail : (Int, Int)) -> State
+%name State state, state1, state2
+
+Show State where
+  show (MkState head tail) = "Head: " ++ show head ++ " Tail: " ++ show tail
+
+emptyState : State
+emptyState = MkState (0,0) (0,0)
+
+tail : State -> (Int, Int)
+tail (MkState head x) = x
+
+touching : (Int, Int) -> (Int, Int) -> Bool
+touching (x, y) (z, w) =
+  let (u, v) = (abs (x - z), abs (y - w)) in
+  u <= 1 && v <= 1
+
+-- Move the head in a particular direction, causing the tail to follow if needed
+moveHead : Direction -> State -> State
+moveHead direction (MkState head tail) =
+  let newHead = applyDirection direction head in
+  if touching newHead tail
+    then MkState newHead tail
+    else let newTail = applyDirection (invert direction) newHead in
+         MkState newHead newTail
+
+-- Apply a movement to the head, returning the sequence of tail positions, including the starting
+-- position
+applyMotion : (motion : Motion) -> State -> (State, Vect (S (distance motion)) State)
+applyMotion motion state = helper (breakdown motion) state
+  where helper : (directions : Vect n Direction) -> State -> (State, Vect (S n) State)
+        helper [] state = (state, [state])
+        helper (x :: xs) state =
+          let newState = moveHead x state
+              (resState, rest) = helper xs newState
+          in (resState, state :: rest)
+
+-- Apply all the motions in a list to the head, returning the full sequence of positions
+applyMotions : (motions : List Motion) -> State -> (State, List State)
+applyMotions [] state = (state, [state])
+applyMotions (x :: xs) state =
+  let (newState, motions) = applyMotion x state
+      (outputState, rest) = applyMotions xs newState
+  in (outputState, (toList motions) ++ rest)
+
+simple = """
+  R 4
+  U 4
+  L 3
+  D 1
+  R 4
+  D 1
+  L 5
+  R 2
+  """
+
+testPart1 : IO ()
+testPart1 =
+  case parseMotions simple of
+    Nothing => putStrLn "Failed to parse motions"
+    Just motions =>
+      let (state, states) = applyMotions motions emptyState
+          tails = map tail states
+          uniqueTails = nub tails
+      in do putStrLn "Movements:"
+            traverse_ printLn motions
+            putStrLn "\nSteps:"
+            traverse_ printLn states
+            putStrLn "\nUnique Tails:"
+            printLn $ length uniqueTails
+
+part1 : String -> Maybe Nat
+part1 input =
+  case parseMotions input of
+    Nothing => Nothing
+    Just motions =>
+      let (state, states) = applyMotions motions emptyState
+          tails = map tail states
+      in Just . length . nub $ tails
+
+partial main : IO ()
+main =
+  do file <- readFile "input"
+     case file of
+       Left err => printLn err
+       Right contents =>
+        case part1 contents of
+          Nothing => printLn "Error in part 1"
+          Just part1Count =>
+            putStrLn ("Part 1: " ++ show part1Count)
diff --git a/09/input b/09/input
new file mode 100644
index 0000000..b6c2ce5
--- /dev/null
+++ b/09/input
@@ -0,0 +1,2000 @@
+U 2
+D 2
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