diff --git a/haskellAoC/inputs/2020/08 b/haskellAoC/inputs/2020/08
new file mode 100644
index 0000000..15231f5
--- /dev/null
+++ b/haskellAoC/inputs/2020/08
@@ -0,0 +1,637 @@
+jmp +248
+acc +11
+acc +50
+acc +44
+jmp +531
+acc -17
+jmp +572
+acc +19
+acc +9
+jmp +221
+nop +373
+acc +7
+jmp +502
+acc +39
+jmp +12
+acc +7
+nop +482
+jmp +144
+acc -4
+jmp +85
+acc +12
+nop +446
+nop +162
+jmp +270
+acc -19
+jmp +402
+acc +8
+acc +28
+acc -13
+acc +30
+jmp +81
+acc -15
+jmp +20
+acc +28
+jmp -19
+nop +190
+acc +2
+jmp +61
+nop +237
+jmp +421
+acc +24
+jmp +221
+acc +1
+jmp +1
+jmp +265
+nop +94
+jmp +1
+jmp +370
+acc +19
+nop +39
+jmp +454
+jmp +162
+jmp +196
+jmp +7
+acc +37
+acc +14
+jmp +542
+acc -10
+acc +1
+jmp +324
+nop -45
+acc -5
+jmp +303
+acc +25
+acc +17
+nop +74
+nop +330
+jmp -7
+acc +45
+jmp +483
+acc -4
+jmp +230
+jmp +61
+jmp +1
+nop +440
+jmp +104
+acc +33
+jmp +140
+acc -8
+jmp +19
+acc -10
+acc +0
+acc +8
+acc +30
+jmp +37
+jmp +457
+jmp +108
+jmp +182
+acc +23
+acc +38
+acc -1
+acc +8
+jmp +330
+acc +2
+acc -2
+nop +483
+acc +31
+jmp +426
+acc +25
+acc +1
+jmp +296
+acc +10
+acc +32
+jmp +223
+acc +3
+nop +350
+acc +29
+acc +4
+jmp +427
+acc +42
+jmp +312
+acc +7
+acc -6
+nop +366
+nop +409
+jmp +364
+jmp -78
+acc +42
+jmp +159
+acc +33
+jmp +128
+nop +86
+acc +5
+jmp +1
+acc +47
+jmp +150
+acc -8
+jmp -101
+acc +31
+nop +55
+acc +2
+jmp +39
+jmp +12
+acc +5
+jmp +1
+jmp -115
+nop +141
+nop +418
+jmp +75
+nop +430
+acc -19
+acc -12
+jmp +83
+jmp +82
+acc +27
+jmp -65
+acc -5
+jmp +422
+acc +16
+acc +20
+jmp +336
+acc +29
+jmp -110
+acc +1
+acc +13
+acc +37
+jmp +38
+acc +45
+acc +2
+acc +45
+jmp -12
+acc +36
+acc +26
+acc +50
+jmp +343
+acc -17
+acc -18
+acc +34
+acc +23
+jmp +274
+acc +20
+acc +12
+nop +129
+acc -1
+jmp +5
+acc +39
+acc +40
+acc +28
+jmp +272
+jmp +147
+acc +50
+jmp +1
+acc +17
+jmp -131
+acc +8
+acc -17
+acc -16
+acc +7
+jmp +25
+acc +47
+acc +14
+acc +27
+acc -2
+jmp +224
+acc -6
+acc -10
+acc +23
+jmp -109
+acc -1
+jmp -145
+acc +40
+nop +275
+jmp +420
+nop -92
+nop -43
+jmp +1
+jmp -134
+nop +297
+acc +14
+jmp +60
+nop +412
+nop +14
+jmp -79
+jmp +1
+acc +25
+jmp +176
+jmp -206
+acc +50
+acc +17
+jmp +271
+acc +9
+nop -82
+acc +6
+acc +19
+jmp +184
+acc +34
+acc +32
+acc -6
+jmp -21
+jmp -4
+nop -154
+acc +38
+jmp +10
+acc +25
+acc +46
+acc +32
+jmp +65
+acc -3
+acc +44
+jmp -153
+acc +31
+jmp +21
+acc +31
+acc +40
+jmp +137
+nop +307
+acc -10
+jmp -193
+acc +5
+acc +0
+acc +42
+acc -7
+jmp -104
+jmp +233
+acc +41
+acc +42
+acc +43
+jmp +358
+acc +13
+nop +140
+acc +20
+jmp +337
+acc +18
+acc -7
+acc -14
+jmp -213
+nop +142
+acc +13
+jmp +115
+acc +48
+acc +30
+acc +15
+jmp +283
+acc -14
+jmp -153
+jmp -75
+jmp -178
+acc +36
+acc +9
+jmp +32
+acc +28
+jmp -229
+jmp +93
+acc +41
+jmp +91
+acc -17
+acc +3
+jmp +163
+nop +129
+acc +0
+nop -169
+acc -11
+jmp -23
+acc +8
+acc -8
+jmp +106
+acc +8
+acc +43
+acc -3
+acc +25
+jmp -15
+nop -296
+acc -4
+jmp +220
+nop -244
+acc +38
+acc -3
+nop -163
+jmp -169
+jmp -304
+jmp +169
+acc +22
+acc -5
+acc +21
+acc +7
+jmp -162
+acc +17
+jmp -229
+nop +35
+acc +42
+acc +12
+acc +12
+jmp +95
+acc -7
+nop +136
+jmp +130
+acc +0
+acc +0
+acc +16
+acc +50
+jmp -297
+nop +183
+nop +104
+acc +18
+jmp -65
+acc -4
+jmp +1
+jmp +227
+nop -76
+jmp -109
+acc +27
+acc -2
+acc -9
+jmp +16
+nop +99
+acc +46
+acc -7
+nop +2
+jmp +258
+acc -10
+jmp +122
+acc -19
+jmp +23
+nop -205
+acc -16
+jmp +81
+nop +235
+acc -16
+jmp +69
+acc -11
+acc +4
+jmp +1
+jmp -80
+acc -19
+jmp +108
+acc +31
+acc -7
+nop -137
+acc +26
+jmp -185
+acc -3
+acc +44
+acc -2
+acc +43
+jmp -137
+acc +14
+nop +96
+jmp -28
+acc +5
+acc +19
+jmp -31
+jmp +18
+jmp -356
+acc +34
+acc +45
+jmp +170
+acc +39
+acc +3
+acc +22
+acc +23
+jmp -370
+jmp -73
+acc +23
+acc +46
+acc +8
+jmp -297
+acc +46
+jmp -387
+jmp -312
+jmp -345
+jmp +229
+acc -6
+jmp +74
+nop -209
+acc +43
+nop -151
+acc +41
+jmp -182
+acc -12
+acc -5
+acc -13
+acc +3
+jmp -386
+acc +45
+acc +9
+nop -97
+jmp -411
+acc +0
+jmp +151
+nop +150
+acc +17
+jmp -144
+acc +3
+acc +12
+nop +55
+jmp -377
+jmp -421
+nop +52
+acc -18
+acc -9
+jmp -77
+acc -14
+acc +33
+nop -316
+acc +44
+jmp -193
+nop +150
+acc -16
+jmp -294
+acc +26
+acc -14
+acc -7
+jmp -61
+nop -84
+acc +0
+jmp -105
+acc +48
+jmp +1
+acc -6
+jmp -109
+acc -12
+acc +37
+acc +24
+jmp +73
+jmp -275
+acc +14
+acc -19
+jmp -156
+nop -147
+jmp -94
+acc -4
+acc +50
+acc +26
+acc -1
+jmp -392
+nop +58
+jmp -440
+acc -1
+jmp -85
+acc +39
+acc +8
+jmp -318
+nop -123
+jmp +133
+acc -18
+jmp +131
+acc +50
+jmp -401
+jmp -458
+acc -9
+acc +23
+jmp +26
+acc +15
+acc -5
+nop -236
+jmp -89
+acc -3
+acc +28
+jmp +98
+jmp -413
+acc -19
+acc +41
+acc +21
+jmp -365
+nop +97
+acc +18
+acc +44
+jmp -186
+acc -3
+acc +31
+nop -356
+acc +26
+jmp -217
+jmp -13
+acc +42
+jmp -437
+jmp -322
+jmp +1
+jmp -81
+acc +28
+acc +0
+acc +45
+acc +36
+jmp -441
+acc +50
+acc +23
+acc +1
+acc +45
+jmp -11
+acc +16
+acc -13
+acc +16
+jmp +13
+jmp -419
+jmp +1
+jmp +66
+acc +40
+acc -5
+acc -8
+acc +39
+jmp +61
+acc +8
+acc +25
+acc +41
+jmp -395
+acc +5
+acc +28
+jmp -70
+jmp +1
+acc +15
+acc -11
+jmp -437
+acc +17
+acc +30
+acc -15
+acc +22
+jmp -91
+acc +44
+acc +47
+acc +0
+acc +39
+jmp -258
+jmp -514
+acc +46
+jmp -478
+acc +38
+acc +12
+acc +44
+jmp -167
+acc +41
+jmp +1
+acc +30
+nop -337
+jmp -521
+acc -11
+nop -426
+jmp -68
+acc -11
+jmp -331
+acc +44
+acc +6
+acc +13
+jmp +1
+jmp -519
+acc +48
+acc +13
+acc +34
+jmp -51
+acc +19
+acc +46
+acc +26
+acc +35
+jmp -345
+acc +20
+jmp +1
+jmp -220
+acc +18
+acc +43
+nop -65
+jmp -335
+jmp -305
+acc +19
+acc -1
+jmp -551
+acc +40
+acc +11
+acc -13
+jmp -196
+acc +18
+nop -460
+acc +28
+jmp -266
+acc +41
+nop -450
+acc +20
+jmp -380
+acc +24
+acc +44
+acc +2
+acc +0
+jmp +22
+acc -10
+acc +0
+acc -8
+jmp -255
+nop -80
+acc +24
+jmp -513
+acc +23
+nop -238
+acc +31
+jmp -504
+nop -461
+acc +40
+acc +39
+jmp +4
+acc +2
+acc +18
+jmp -359
+jmp -143
+acc -5
+jmp -117
+acc -12
+acc +40
+jmp +1
+acc +15
+jmp +1
diff --git a/haskellAoC/src/Y2020/Day08.hs b/haskellAoC/src/Y2020/Day08.hs
new file mode 100644
index 0000000..3620219
--- /dev/null
+++ b/haskellAoC/src/Y2020/Day08.hs
@@ -0,0 +1,49 @@
+module Y2020.Day08 (y20day08) where
+
+import Data.List
+import Data.List.Split
+import qualified Data.Map as M
+
+data Instr = Acc Int | Jmp Int | Nop Int deriving (Show)
+
+-- current offset, current acc, visited offsets
+type State = (Int, Int, [Int])
+
+runInstructions :: M.Map Int Instr -> State -> (Bool, Int)
+runInstructions instr (cur, acc, visited)
+  | cur `elem` visited           = (False, acc)   -- looping
+  | cur `M.notMember` instr      = (True, acc) -- terminated
+  | otherwise                    = runInstructions instr (newCur, newAcc, newVisited)
+  where newVisited       = cur:visited
+        (newCur, newAcc) = case (instr M.! cur) of
+                             Nop _      -> (cur + 1, acc)
+                             Acc qty    -> (cur + 1, acc + qty)
+                             Jmp ofs    -> (cur + ofs, acc)
+
+parseInput :: String -> Instr
+parseInput input
+  | "nop" `isPrefixOf` input = Nop nb
+  | "acc" `isPrefixOf` input = Acc nb
+  | "jmp" `isPrefixOf` input = Jmp nb
+  where nb                    = (sign raw_sign) 0 number :: Int
+        (raw_sign:raw_number) = (splitOn " " input) !! 1
+        sign '+'              = (+)
+        sign '-'              = (-)
+        number                = read raw_number :: Int
+
+testSwappedNopJmp :: M.Map Int Instr -> Int -> Int
+testSwappedNopJmp original offset = case original M.! offset of
+                                      Acc _     -> next
+                                      Jmp qty   -> resWithSwap (Nop qty)
+                                      Nop qty   -> resWithSwap (Jmp qty)
+  where next                     = testSwappedNopJmp original (offset + 1)
+        resWithSwap swapped      = case (runInstructions (swappedInput swapped) (0, 0, [])) of
+                                     (True, acc) -> acc
+                                     (False, _) -> next
+        swappedInput new         = M.insert offset new original
+
+y20day08 :: [String] -> (String, String)
+y20day08 input = (part1, part2)
+  where part1    = show $ snd $ runInstructions ops (0, 0, [])
+        part2    = show $ testSwappedNopJmp ops 0
+        ops      = M.fromList $ zip (iterate (+ 1) 0) $ map parseInput input
diff --git a/haskellAoC/src/Y2020/Days.hs b/haskellAoC/src/Y2020/Days.hs
index 7eba71e..e2c9c7a 100644
--- a/haskellAoC/src/Y2020/Days.hs
+++ b/haskellAoC/src/Y2020/Days.hs
@@ -7,6 +7,7 @@ import Y2020.Day04
 import Y2020.Day05
 import Y2020.Day06
 import Y2020.Day07
+import Y2020.Day08
 
 year2020 :: String -> [String] -> (String, String)
 year2020 "01" = y20day01
@@ -16,3 +17,4 @@ year2020 "04" = y20day04
 year2020 "05" = y20day05
 year2020 "06" = y20day06
 year2020 "07" = y20day07
+year2020 "08" = y20day08