diff --git a/aoc2022.cabal b/aoc2022.cabal
index 08b48f1..14d1c5a 100644
--- a/aoc2022.cabal
+++ b/aoc2022.cabal
@@ -18,7 +18,8 @@ test-suite day01aoctest
   type:                exitcode-stdio-1.0
   hs-source-dirs:      src/day01/test, src/day01
   main-is:             AoCTest.hs
-  other-modules:       Day1Lib
+  other-modules:       
+      Day1Lib
   build-depends:       base
                      , HUnit
                      , split
@@ -65,7 +66,8 @@ test-suite day02aoctest
   type:                exitcode-stdio-1.0
   hs-source-dirs:      src/day02/test, src/day02
   main-is:             AoCTest.hs
-  other-modules:       Day2Lib
+  other-modules:       
+      Day2Lib
   build-depends:       base
                      , HUnit
   ghc-options:         -threaded -rtsopts -with-rtsopts=-N
@@ -103,4 +105,30 @@ executable day022
                        -Wmissing-export-lists
                        -Wmissing-home-modules
                        -Wpartial-fields
-                       -Wredundant-constraints
\ No newline at end of file
+                       -Wredundant-constraints
+
+-- Day 3
+
+test-suite day03basictest
+  type:                exitcode-stdio-1.0
+  hs-source-dirs:      src/day03/test, src/day03
+  main-is:             Basic.hs
+  other-modules:       
+      Day3Lib
+  build-depends:       base
+                     , HUnit
+                     , split
+  ghc-options:         -threaded -rtsopts -with-rtsopts=-N
+  default-language:    Haskell2010
+
+test-suite day03aoctest
+  type:                exitcode-stdio-1.0
+  hs-source-dirs:      src/day03/test, src/day03
+  main-is:             AoCTest.hs
+  other-modules:       
+      Day3Lib
+  build-depends:       base
+                     , HUnit
+                     , split
+  ghc-options:         -threaded -rtsopts -with-rtsopts=-N
+  default-language:    Haskell2010
\ No newline at end of file
diff --git a/data/input030.txt b/data/input030.txt
new file mode 100644
index 0000000..40543a9
--- /dev/null
+++ b/data/input030.txt
@@ -0,0 +1,6 @@
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\ No newline at end of file
diff --git a/data/input031.txt b/data/input031.txt
new file mode 100644
index 0000000..efc5af8
--- /dev/null
+++ b/data/input031.txt
@@ -0,0 +1,300 @@
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\ No newline at end of file
diff --git a/src/day03/Day3Lib.hs b/src/day03/Day3Lib.hs
new file mode 100644
index 0000000..8a3a82e
--- /dev/null
+++ b/src/day03/Day3Lib.hs
@@ -0,0 +1,23 @@
+module Day3Lib
+  ( score,
+    --
+    processInput1,
+    processInput2,
+  )
+where
+
+import Data.Char (isLower, ord)
+import Data.List (intersect)
+import Data.List.Split (chunksOf)
+
+score c = if isLower c then ord c - ord 'a' + 1 else ord c - ord 'A' + 27
+
+-- ###################
+
+processInput1 = sum . (map processLine1) . lines
+
+processLine1 r = score . head $ intersect (take ((length r) `div` 2) r) (drop ((length r) `div` 2) r)
+
+processInput2 = sum . (map processChunk2) . (chunksOf 3) . lines
+
+processChunk2 [a, b, c] = score . head . (intersect c) $ intersect a b
diff --git a/src/day03/test/AoCTest.hs b/src/day03/test/AoCTest.hs
new file mode 100644
index 0000000..4e73274
--- /dev/null
+++ b/src/day03/test/AoCTest.hs
@@ -0,0 +1,41 @@
+import Day3Lib (processInput1, processInput2)
+import System.IO
+import Test.HUnit
+
+testCases1 =
+  [ ("data/input030.txt", 157),
+    ("data/input031.txt", 8153)
+  ]
+
+testCase1 (file, result) = do
+  withFile
+    file
+    ReadMode
+    ( \handle -> do
+        contents <- hGetContents handle
+        assertEqual "input test" result $ processInput1 contents
+    )
+
+testCases2 =
+  [ ("data/input030.txt", 70),
+    ("data/input031.txt", 2342)
+  ]
+
+testCase2 (file, result) = do
+  withFile
+    file
+    ReadMode
+    ( \handle -> do
+        contents <- hGetContents handle
+        assertEqual "input test" result $ processInput2 contents
+    )
+
+tests =
+  TestList $
+    [TestCase (testCase1 c) | c <- testCases1]
+      ++ [TestCase (testCase2 c) | c <- testCases2]
+
+main :: IO ()
+main = do
+  runTestTT tests
+  return ()
diff --git a/src/day03/test/Basic.hs b/src/day03/test/Basic.hs
new file mode 100644
index 0000000..b620363
--- /dev/null
+++ b/src/day03/test/Basic.hs
@@ -0,0 +1,19 @@
+import Day3Lib
+import Test.HUnit
+
+ta = TestCase (assertEqual "a" 1 $ score 'a')
+
+tz = TestCase (assertEqual "z" 26 $ score 'z')
+
+tA = TestCase (assertEqual "A" 27 $ score 'A')
+
+tZ = TestCase (assertEqual "Z" 52 $ score 'Z')
+
+tests =
+  TestList $
+    [ta, tz, tA, tZ]
+
+main :: IO ()
+main = do
+  runTestTT tests
+  return ()