diff --git a/src/main/kotlin/com/basdado/adventofcode/day11/Day11.kt b/src/main/kotlin/com/basdado/adventofcode/day11/Day11.kt
new file mode 100644
index 0000000..98e5528
--- /dev/null
+++ b/src/main/kotlin/com/basdado/adventofcode/day11/Day11.kt
@@ -0,0 +1,119 @@
+package com.basdado.adventofcode.day11
+
+import com.basdado.adventofcode.IntCodeProgram
+import com.basdado.adventofcode.loadProgramData
+
+const val DAY11_INPUT_PATH = "/day/11/input.txt"
+
+fun main() {
+    Day11.puzzle1()
+    Day11.puzzle2()
+}
+
+object Day11 {
+
+    fun puzzle1() {
+        val programData = loadProgramData(DAY11_INPUT_PATH)
+        val program = IntCodeProgram(programData + LongArray(16384), longArrayOf())
+        val hull = mutableMapOf<Vector2i, Int>()
+        paintHull(hull, program)
+        printHull(hull)
+        println(hull.size)
+    }
+
+    fun puzzle2() {
+
+        val programData = loadProgramData(DAY11_INPUT_PATH)
+        val program = IntCodeProgram(programData + LongArray(16384), longArrayOf())
+        val hull = mutableMapOf<Vector2i, Int>(
+            // Paint position 0,0 white
+            Pair(Vector2i(0, 0), 1)
+        )
+        paintHull(hull, program)
+        printHull(hull)
+    }
+
+    private fun printHull(hull: MutableMap<Vector2i, Int>) {
+        val min = Vector2i(
+            hull.keys.map { it.x }.min()!!,
+            hull.keys.map { it.y }.min()!!
+        )
+        val max = Vector2i(
+            hull.keys.map { it.x }.max()!!,
+            hull.keys.map { it.y }.max()!!
+        )
+        (max.y downTo min.y).forEach { y ->
+            (min.x..max.x).forEach { x ->
+                print(
+                    when (hull[Vector2i(x, y)]) {
+                        0 -> "."
+                        1 -> "#"
+                        null -> " "
+                        else -> "E"
+                    }
+                )
+            }
+            println()
+        }
+    }
+
+    private fun paintHull(
+        hull: MutableMap<Vector2i, Int>,
+        program: IntCodeProgram
+    ) {
+        var pos = Vector2i(0, 0)
+        var dir = UP
+
+        var lastHullPaintingSize = 0
+        var hullPaintingSizeConstant = 0
+        while (hullPaintingSizeConstant < 1000) {
+            lastHullPaintingSize = hull.size
+
+            program.pushInput((hull[pos] ?: 0).toLong())
+            val color = program.executeUntilOutput() ?: break
+            hull[pos] = color.toInt()
+
+            val rotate = program.executeUntilOutput() ?: break
+            val newDir = if (rotate == 0L) {
+                // Turn left
+                when (dir) {
+                    UP -> LEFT
+                    LEFT -> DOWN
+                    DOWN -> RIGHT
+                    RIGHT -> UP
+                    else -> throw IllegalStateException("Invalid direction: $dir")
+                }
+            } else {
+                when (dir) {
+                    UP -> RIGHT
+                    RIGHT -> DOWN
+                    DOWN -> LEFT
+                    LEFT -> UP
+                    else -> throw IllegalStateException("Invalid direction: $dir")
+                }
+            }
+            pos += newDir
+            dir = newDir
+
+            if (lastHullPaintingSize == hull.size) {
+                hullPaintingSizeConstant++
+            } else {
+                hullPaintingSizeConstant = 0
+            }
+        }
+    }
+
+    data class Vector2i(val x: Int, val y: Int) {
+
+        operator fun div(d: Int) = Vector2i(x / d, y / d)
+        operator fun minus(n: Int) = Vector2i(x - n, y - n)
+        operator fun minus(v: Vector2i) = Vector2i(x - v.x, y - v.y)
+        operator fun plus(n: Int) = Vector2i(x + n, y + n)
+        operator fun plus(v: Vector2i) = Vector2i(x + v.x, y + v.y)
+    }
+
+    val LEFT = Vector2i(-1, 0)
+    val RIGHT = Vector2i(1, 0)
+    val UP = Vector2i(0, 1)
+    val DOWN = Vector2i(0, -1)
+}
\ No newline at end of file
diff --git a/src/main/resources/day/11/input.txt b/src/main/resources/day/11/input.txt
new file mode 100644
index 0000000..49c351e
--- /dev/null
+++ b/src/main/resources/day/11/input.txt
@@ -0,0 +1 @@
+3,8,1005,8,310,1106,0,11,0,0,0,104,1,104,0,3,8,1002,8,-1,10,101,1,10,10,4,10,1008,8,0,10,4,10,1001,8,0,29,1,2,11,10,1,1101,2,10,2,1008,18,10,2,106,3,10,3,8,1002,8,-1,10,1001,10,1,10,4,10,1008,8,1,10,4,10,102,1,8,67,2,105,15,10,3,8,1002,8,-1,10,101,1,10,10,4,10,1008,8,0,10,4,10,1001,8,0,93,2,1001,16,10,3,8,102,-1,8,10,1001,10,1,10,4,10,1008,8,1,10,4,10,102,1,8,119,3,8,1002,8,-1,10,1001,10,1,10,4,10,1008,8,1,10,4,10,101,0,8,141,2,7,17,10,1,1103,16,10,3,8,1002,8,-1,10,101,1,10,10,4,10,108,0,8,10,4,10,102,1,8,170,3,8,1002,8,-1,10,1001,10,1,10,4,10,1008,8,1,10,4,10,1002,8,1,193,1,7,15,10,2,105,13,10,1006,0,92,1006,0,99,3,8,1002,8,-1,10,101,1,10,10,4,10,108,1,8,10,4,10,101,0,8,228,1,3,11,10,1006,0,14,1006,0,71,3,8,1002,8,-1,10,101,1,10,10,4,10,1008,8,0,10,4,10,101,0,8,261,2,2,2,10,1006,0,4,3,8,102,-1,8,10,101,1,10,10,4,10,108,0,8,10,4,10,101,0,8,289,101,1,9,9,1007,9,1049,10,1005,10,15,99,109,632,104,0,104,1,21101,0,387240009756,1,21101,327,0,0,1105,1,431,21101,0,387239486208,1,21102,1,338,0,1106,0,431,3,10,104,0,104,1,3,10,104,0,104,0,3,10,104,0,104,1,3,10,104,0,104,1,3,10,104,0,104,0,3,10,104,0,104,1,21102,3224472579,1,1,21101,0,385,0,1106,0,431,21101,0,206253952003,1,21102,396,1,0,1105,1,431,3,10,104,0,104,0,3,10,104,0,104,0,21102,709052072296,1,1,21102,419,1,0,1105,1,431,21102,1,709051962212,1,21102,430,1,0,1106,0,431,99,109,2,21202,-1,1,1,21102,1,40,2,21102,462,1,3,21102,452,1,0,1105,1,495,109,-2,2105,1,0,0,1,0,0,1,109,2,3,10,204,-1,1001,457,458,473,4,0,1001,457,1,457,108,4,457,10,1006,10,489,1101,0,0,457,109,-2,2105,1,0,0,109,4,2102,1,-1,494,1207,-3,0,10,1006,10,512,21101,0,0,-3,22101,0,-3,1,21202,-2,1,2,21102,1,1,3,21101,531,0,0,1105,1,536,109,-4,2106,0,0,109,5,1207,-3,1,10,1006,10,559,2207,-4,-2,10,1006,10,559,21202,-4,1,-4,1105,1,627,22102,1,-4,1,21201,-3,-1,2,21202,-2,2,3,21102,1,578,0,1105,1,536,21202,1,1,-4,21102,1,1,-1,2207,-4,-2,10,1006,10,597,21101,0,0,-1,22202,-2,-1,-2,2107,0,-3,10,1006,10,619,21201,-1,0,1,21102,1,619,0,106,0,494,21202,-2,-1,-2,22201,-4,-2,-4,109,-5,2106,0,0