diff --git a/config.json b/config.json
index 7e520b9..eda94d4 100644
--- a/config.json
+++ b/config.json
@@ -406,6 +406,14 @@
         "practices": [],
         "prerequisites": [],
         "difficulty": 4
+      },
+      {
+        "slug": "twelve-days",
+        "name": "Twelve Days",
+        "uuid": "69322771-7756-42a9-a79b-8700ce877700",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 4
       }
     ]
   },
diff --git a/exercises/practice/twelve-days/.busted b/exercises/practice/twelve-days/.busted
new file mode 100644
index 0000000..86b84e7
--- /dev/null
+++ b/exercises/practice/twelve-days/.busted
@@ -0,0 +1,5 @@
+return {
+  default = {
+    ROOT = { '.' }
+  }
+}
diff --git a/exercises/practice/twelve-days/.docs/instructions.md b/exercises/practice/twelve-days/.docs/instructions.md
new file mode 100644
index 0000000..83bb6e1
--- /dev/null
+++ b/exercises/practice/twelve-days/.docs/instructions.md
@@ -0,0 +1,36 @@
+# Instructions
+
+Your task in this exercise is to write code that returns the lyrics of the song: "The Twelve Days of Christmas."
+
+"The Twelve Days of Christmas" is a common English Christmas carol.
+Each subsequent verse of the song builds on the previous verse.
+
+The lyrics your code returns should _exactly_ match the full song text shown below.
+
+## Lyrics
+
+```text
+On the first day of Christmas my true love gave to me: a Partridge in a Pear Tree.
+
+On the second day of Christmas my true love gave to me: two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the third day of Christmas my true love gave to me: three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the fourth day of Christmas my true love gave to me: four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the fifth day of Christmas my true love gave to me: five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the sixth day of Christmas my true love gave to me: six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the seventh day of Christmas my true love gave to me: seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the eighth day of Christmas my true love gave to me: eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the ninth day of Christmas my true love gave to me: nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the tenth day of Christmas my true love gave to me: ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the eleventh day of Christmas my true love gave to me: eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+
+On the twelfth day of Christmas my true love gave to me: twelve Drummers Drumming, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
+```
diff --git a/exercises/practice/twelve-days/.meta/config.json b/exercises/practice/twelve-days/.meta/config.json
new file mode 100644
index 0000000..9d75243
--- /dev/null
+++ b/exercises/practice/twelve-days/.meta/config.json
@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "glennj"
+  ],
+  "files": {
+    "solution": [
+      "twelve_days.moon"
+    ],
+    "test": [
+      "twelve_days_spec.moon"
+    ],
+    "example": [
+      ".meta/example.moon"
+    ]
+  },
+  "blurb": "Output the lyrics to 'The Twelve Days of Christmas'.",
+  "source": "Wikipedia",
+  "source_url": "https://en.wikipedia.org/wiki/The_Twelve_Days_of_Christmas_(song)"
+}
diff --git a/exercises/practice/twelve-days/.meta/example.moon b/exercises/practice/twelve-days/.meta/example.moon
new file mode 100644
index 0000000..4eb01c5
--- /dev/null
+++ b/exercises/practice/twelve-days/.meta/example.moon
@@ -0,0 +1,31 @@
+nth = { 'first', 'second', 'third', 'fourth', 'fifth', 'sixth', 'seventh',
+        'eighth', 'ninth', 'tenth', 'eleventh', 'twelfth' }
+
+presents = {
+  'a Partridge in a Pear Tree',
+  'two Turtle Doves',
+  'three French Hens',
+  'four Calling Birds',
+  'five Gold Rings',
+  'six Geese-a-Laying',
+  'seven Swans-a-Swimming',
+  'eight Maids-a-Milking',
+  'nine Ladies Dancing',
+  'ten Lords-a-Leaping',
+  'eleven Pipers Piping',
+  'twelve Drummers Drumming',
+}
+
+gifts = (n) ->
+  items = {}
+  table.insert items, 1, presents[i] for i = 1, n
+  items[#items] = "and #{items[#items]}" if n > 1
+  table.concat items, ', '
+
+
+verse = (n) ->
+  "On the #{nth[n]} day of Christmas my true love gave to me: #{gifts n}."
+
+{
+  recite: (start, stop) -> [verse i for i = start, stop]
+}
diff --git a/exercises/practice/twelve-days/.meta/spec_generator.moon b/exercises/practice/twelve-days/.meta/spec_generator.moon
new file mode 100644
index 0000000..dc3b98f
--- /dev/null
+++ b/exercises/practice/twelve-days/.meta/spec_generator.moon
@@ -0,0 +1,21 @@
+str_list = (list, level) ->
+  if #list <= 1
+    "{#{table.concat [quote elem for elem in *list], ', '}}"
+  else
+    item = [indent quote(elem) .. ',', level + 1 for elem in *list]
+    table.insert item, 1, '{'
+    table.insert item, indent('}', level)
+    table.concat item, '\n'
+
+
+{
+  module_name: 'TwelveDays',
+
+  generate_test: (case, level) ->
+    lines = {
+      "result = TwelveDays.#{case.property} #{case.input.startVerse}, #{case.input.endVerse}",
+      "expected = #{str_list case.expected, level}",
+      "assert.are.same expected, result"
+    }
+    table.concat [indent line, level for line in *lines], '\n'
+}
diff --git a/exercises/practice/twelve-days/.meta/tests.toml b/exercises/practice/twelve-days/.meta/tests.toml
new file mode 100644
index 0000000..01fbc03
--- /dev/null
+++ b/exercises/practice/twelve-days/.meta/tests.toml
@@ -0,0 +1,55 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[c0b5a5e6-c89d-49b1-a6b2-9f523bff33f7]
+description = "verse -> first day a partridge in a pear tree"
+
+[1c64508a-df3d-420a-b8e1-fe408847854a]
+description = "verse -> second day two turtle doves"
+
+[a919e09c-75b2-4e64-bb23-de4a692060a8]
+description = "verse -> third day three french hens"
+
+[9bed8631-ec60-4894-a3bb-4f0ec9fbe68d]
+description = "verse -> fourth day four calling birds"
+
+[cf1024f0-73b6-4545-be57-e9cea565289a]
+description = "verse -> fifth day five gold rings"
+
+[50bd3393-868a-4f24-a618-68df3d02ff04]
+description = "verse -> sixth day six geese-a-laying"
+
+[8f29638c-9bf1-4680-94be-e8b84e4ade83]
+description = "verse -> seventh day seven swans-a-swimming"
+
+[7038d6e1-e377-47ad-8c37-10670a05bc05]
+description = "verse -> eighth day eight maids-a-milking"
+
+[37a800a6-7a56-4352-8d72-0f51eb37cfe8]
+description = "verse -> ninth day nine ladies dancing"
+
+[10b158aa-49ff-4b2d-afc3-13af9133510d]
+description = "verse -> tenth day ten lords-a-leaping"
+
+[08d7d453-f2ba-478d-8df0-d39ea6a4f457]
+description = "verse -> eleventh day eleven pipers piping"
+
+[0620fea7-1704-4e48-b557-c05bf43967f0]
+description = "verse -> twelfth day twelve drummers drumming"
+
+[da8b9013-b1e8-49df-b6ef-ddec0219e398]
+description = "lyrics -> recites first three verses of the song"
+
+[c095af0d-3137-4653-ad32-bfb899eda24c]
+description = "lyrics -> recites three verses from the middle of the song"
+
+[20921bc9-cc52-4627-80b3-198cbbfcf9b7]
+description = "lyrics -> recites the whole song"
diff --git a/exercises/practice/twelve-days/twelve_days.moon b/exercises/practice/twelve-days/twelve_days.moon
new file mode 100644
index 0000000..b643e6b
--- /dev/null
+++ b/exercises/practice/twelve-days/twelve_days.moon
@@ -0,0 +1,4 @@
+{
+  recite: (start, stop) -> 
+    error 'Implement me'
+}
diff --git a/exercises/practice/twelve-days/twelve_days_spec.moon b/exercises/practice/twelve-days/twelve_days_spec.moon
new file mode 100644
index 0000000..9bf188c
--- /dev/null
+++ b/exercises/practice/twelve-days/twelve_days_spec.moon
@@ -0,0 +1,100 @@
+TwelveDays = require 'twelve_days'
+
+describe 'twelve-days', ->
+  describe 'verse', ->
+    it 'first day a partridge in a pear tree', ->
+      result = TwelveDays.recite 1, 1
+      expected = {'On the first day of Christmas my true love gave to me: a Partridge in a Pear Tree.'}
+      assert.are.same expected, result
+
+    pending 'second day two turtle doves', ->
+      result = TwelveDays.recite 2, 2
+      expected = {'On the second day of Christmas my true love gave to me: two Turtle Doves, and a Partridge in a Pear Tree.'}
+      assert.are.same expected, result
+
+    pending 'third day three french hens', ->
+      result = TwelveDays.recite 3, 3
+      expected = {'On the third day of Christmas my true love gave to me: three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'}
+      assert.are.same expected, result
+
+    pending 'fourth day four calling birds', ->
+      result = TwelveDays.recite 4, 4
+      expected = {'On the fourth day of Christmas my true love gave to me: four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'}
+      assert.are.same expected, result
+
+    pending 'fifth day five gold rings', ->
+      result = TwelveDays.recite 5, 5
+      expected = {'On the fifth day of Christmas my true love gave to me: five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'}
+      assert.are.same expected, result
+
+    pending 'sixth day six geese-a-laying', ->
+      result = TwelveDays.recite 6, 6
+      expected = {'On the sixth day of Christmas my true love gave to me: six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'}
+      assert.are.same expected, result
+
+    pending 'seventh day seven swans-a-swimming', ->
+      result = TwelveDays.recite 7, 7
+      expected = {'On the seventh day of Christmas my true love gave to me: seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'}
+      assert.are.same expected, result
+
+    pending 'eighth day eight maids-a-milking', ->
+      result = TwelveDays.recite 8, 8
+      expected = {'On the eighth day of Christmas my true love gave to me: eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'}
+      assert.are.same expected, result
+
+    pending 'ninth day nine ladies dancing', ->
+      result = TwelveDays.recite 9, 9
+      expected = {'On the ninth day of Christmas my true love gave to me: nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'}
+      assert.are.same expected, result
+
+    pending 'tenth day ten lords-a-leaping', ->
+      result = TwelveDays.recite 10, 10
+      expected = {'On the tenth day of Christmas my true love gave to me: ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'}
+      assert.are.same expected, result
+
+    pending 'eleventh day eleven pipers piping', ->
+      result = TwelveDays.recite 11, 11
+      expected = {'On the eleventh day of Christmas my true love gave to me: eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'}
+      assert.are.same expected, result
+
+    pending 'twelfth day twelve drummers drumming', ->
+      result = TwelveDays.recite 12, 12
+      expected = {'On the twelfth day of Christmas my true love gave to me: twelve Drummers Drumming, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.'}
+      assert.are.same expected, result
+
+  describe 'lyrics', ->
+    pending 'recites first three verses of the song', ->
+      result = TwelveDays.recite 1, 3
+      expected = {
+        'On the first day of Christmas my true love gave to me: a Partridge in a Pear Tree.',
+        'On the second day of Christmas my true love gave to me: two Turtle Doves, and a Partridge in a Pear Tree.',
+        'On the third day of Christmas my true love gave to me: three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.',
+      }
+      assert.are.same expected, result
+
+    pending 'recites three verses from the middle of the song', ->
+      result = TwelveDays.recite 4, 6
+      expected = {
+        'On the fourth day of Christmas my true love gave to me: four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.',
+        'On the fifth day of Christmas my true love gave to me: five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.',
+        'On the sixth day of Christmas my true love gave to me: six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.',
+      }
+      assert.are.same expected, result
+
+    pending 'recites the whole song', ->
+      result = TwelveDays.recite 1, 12
+      expected = {
+        'On the first day of Christmas my true love gave to me: a Partridge in a Pear Tree.',
+        'On the second day of Christmas my true love gave to me: two Turtle Doves, and a Partridge in a Pear Tree.',
+        'On the third day of Christmas my true love gave to me: three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.',
+        'On the fourth day of Christmas my true love gave to me: four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.',
+        'On the fifth day of Christmas my true love gave to me: five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.',
+        'On the sixth day of Christmas my true love gave to me: six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.',
+        'On the seventh day of Christmas my true love gave to me: seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.',
+        'On the eighth day of Christmas my true love gave to me: eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.',
+        'On the ninth day of Christmas my true love gave to me: nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.',
+        'On the tenth day of Christmas my true love gave to me: ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.',
+        'On the eleventh day of Christmas my true love gave to me: eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.',
+        'On the twelfth day of Christmas my true love gave to me: twelve Drummers Drumming, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.',
+      }
+      assert.are.same expected, result