diff --git a/config.json b/config.json
index 29929b0..a97f994 100644
--- a/config.json
+++ b/config.json
@@ -102,6 +102,14 @@
         "practices": [],
         "prerequisites": [],
         "difficulty": 2
+      },
+      {
+        "slug": "line-up",
+        "name": "Line Up",
+        "uuid": "faab9c05-bbb8-4b5c-8cb9-6d7019927630",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 2
       }
     ]
   },
diff --git a/exercises/practice/line-up/.busted b/exercises/practice/line-up/.busted
new file mode 100644
index 0000000..86b84e7
--- /dev/null
+++ b/exercises/practice/line-up/.busted
@@ -0,0 +1,5 @@
+return {
+  default = {
+    ROOT = { '.' }
+  }
+}
diff --git a/exercises/practice/line-up/.docs/instructions.md b/exercises/practice/line-up/.docs/instructions.md
new file mode 100644
index 0000000..9e686ec
--- /dev/null
+++ b/exercises/practice/line-up/.docs/instructions.md
@@ -0,0 +1,19 @@
+# Instructions
+
+Given a name and a number, your task is to produce a sentence using that name and that number as an [ordinal numeral][ordinal-numeral].
+Yaʻqūb expects to use numbers from 1 up to 999.
+
+Rules:
+
+- Numbers ending in 1 (unless ending in 11) → `"st"`
+- Numbers ending in 2 (unless ending in 12) → `"nd"`
+- Numbers ending in 3 (unless ending in 13) → `"rd"`
+- All other numbers → `"th"`
+
+Examples:
+
+- `"Mary", 1` → `"Mary, you are the 1st customer we serve today. Thank you!"`
+- `"John", 12` → `"John, you are the 12th customer we serve today. Thank you!"`
+- `"Dahir", 162` → `"Dahir, you are the 162nd customer we serve today. Thank you!"`
+
+[ordinal-numeral]: https://en.wikipedia.org/wiki/Ordinal_numeral
diff --git a/exercises/practice/line-up/.docs/introduction.md b/exercises/practice/line-up/.docs/introduction.md
new file mode 100644
index 0000000..ea07268
--- /dev/null
+++ b/exercises/practice/line-up/.docs/introduction.md
@@ -0,0 +1,7 @@
+# Introduction
+
+Your friend Yaʻqūb works the counter at a deli in town, slicing, weighing, and wrapping orders for a line of hungry customers that gets longer every day.
+Waiting customers are starting to lose track of who is next, so he wants numbered tickets they can use to track the order in which they arrive.
+
+To make the customers feel special, he does not want the ticket to have only a number on it.
+They shall get a proper English sentence with their name and number on it.
diff --git a/exercises/practice/line-up/.meta/config.json b/exercises/practice/line-up/.meta/config.json
new file mode 100644
index 0000000..676d25a
--- /dev/null
+++ b/exercises/practice/line-up/.meta/config.json
@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "glennj"
+  ],
+  "files": {
+    "solution": [
+      "line_up.moon"
+    ],
+    "test": [
+      "line_up_spec.moon"
+    ],
+    "example": [
+      ".meta/example.moon"
+    ]
+  },
+  "blurb": "Help lining up customers at Yaʻqūb's Deli.",
+  "source": "mk-mxp, based on previous work from Exercism contributors codedge and neenjaw",
+  "source_url": "https://forum.exercism.org/t/new-exercise-ordinal-numbers/19147"
+}
diff --git a/exercises/practice/line-up/.meta/example.moon b/exercises/practice/line-up/.meta/example.moon
new file mode 100644
index 0000000..c821cdf
--- /dev/null
+++ b/exercises/practice/line-up/.meta/example.moon
@@ -0,0 +1,12 @@
+{
+  format: (name, number) ->
+    ones, tens = number % 10, number % 100
+
+    suffix = switch ones
+               when 1 then if tens == 11 then 'th' else 'st'
+               when 2 then if tens == 12 then 'th' else 'nd'
+               when 3 then if tens == 13 then 'th' else 'rd'
+               else 'th'
+
+    "#{name}, you are the #{number}#{suffix} customer we serve today. Thank you!"
+}
diff --git a/exercises/practice/line-up/.meta/spec_generator.moon b/exercises/practice/line-up/.meta/spec_generator.moon
new file mode 100644
index 0000000..021f5f8
--- /dev/null
+++ b/exercises/practice/line-up/.meta/spec_generator.moon
@@ -0,0 +1,11 @@
+{
+  module_name: 'LineUp',
+
+  generate_test: (case, level) ->
+    lines = {
+      "result = LineUp.#{case.property} #{quote case.input.name}, #{case.input.number}",
+      "expected = #{quote case.expected}",
+      "assert.are.equal expected, result"
+    }
+    table.concat [indent line, level for line in *lines], '\n'
+}
diff --git a/exercises/practice/line-up/.meta/tests.toml b/exercises/practice/line-up/.meta/tests.toml
new file mode 100644
index 0000000..36fdf1d
--- /dev/null
+++ b/exercises/practice/line-up/.meta/tests.toml
@@ -0,0 +1,67 @@
+# 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.
+
+[7760d1b8-4864-4db4-953b-0fa7c047dbc0]
+description = "format smallest non-exceptional ordinal numeral 4"
+
+[e8b7c715-6baa-4f7b-8fb3-2fa48044ab7a]
+description = "format greatest single digit non-exceptional ordinal numeral 9"
+
+[f370aae9-7ae7-4247-90ce-e8ff8c6934df]
+description = "format non-exceptional ordinal numeral 5"
+
+[37f10dea-42a2-49de-bb92-0b690b677908]
+description = "format non-exceptional ordinal numeral 6"
+
+[d8dfb9a2-3a1f-4fee-9dae-01af3600054e]
+description = "format non-exceptional ordinal numeral 7"
+
+[505ec372-1803-42b1-9377-6934890fd055]
+description = "format non-exceptional ordinal numeral 8"
+
+[8267072d-be1f-4f70-b34a-76b7557a47b9]
+description = "format exceptional ordinal numeral 1"
+
+[4d8753cb-0364-4b29-84b8-4374a4fa2e3f]
+description = "format exceptional ordinal numeral 2"
+
+[8d44c223-3a7e-4f48-a0ca-78e67bf98aa7]
+description = "format exceptional ordinal numeral 3"
+
+[6c4f6c88-b306-4f40-bc78-97cdd583c21a]
+description = "format smallest two digit non-exceptional ordinal numeral 10"
+
+[e257a43f-d2b1-457a-97df-25f0923fc62a]
+description = "format non-exceptional ordinal numeral 11"
+
+[bb1db695-4d64-457f-81b8-4f5a2107e3f4]
+description = "format non-exceptional ordinal numeral 12"
+
+[60a3187c-9403-4835-97de-4f10ebfd63e2]
+description = "format non-exceptional ordinal numeral 13"
+
+[2bdcebc5-c029-4874-b6cc-e9bec80d603a]
+description = "format exceptional ordinal numeral 21"
+
+[74ee2317-0295-49d2-baf0-d56bcefa14e3]
+description = "format exceptional ordinal numeral 62"
+
+[b37c332d-7f68-40e3-8503-e43cbd67a0c4]
+description = "format exceptional ordinal numeral 100"
+
+[0375f250-ce92-4195-9555-00e28ccc4d99]
+description = "format exceptional ordinal numeral 101"
+
+[0d8a4974-9a8a-45a4-aca7-a9fb473c9836]
+description = "format non-exceptional ordinal numeral 112"
+
+[06b62efe-199e-4ce7-970d-4bf73945713f]
+description = "format exceptional ordinal numeral 123"
diff --git a/exercises/practice/line-up/line_up.moon b/exercises/practice/line-up/line_up.moon
new file mode 100644
index 0000000..e69de29
diff --git a/exercises/practice/line-up/line_up_spec.moon b/exercises/practice/line-up/line_up_spec.moon
new file mode 100644
index 0000000..f784c9c
--- /dev/null
+++ b/exercises/practice/line-up/line_up_spec.moon
@@ -0,0 +1,97 @@
+LineUp = require 'line_up'
+
+describe 'line-up', ->
+  it 'format smallest non-exceptional ordinal numeral 4', ->
+    result = LineUp.format 'Gianna', 4
+    expected = 'Gianna, you are the 4th customer we serve today. Thank you!'
+    assert.are.equal expected, result
+
+  pending 'format greatest single digit non-exceptional ordinal numeral 9', ->
+    result = LineUp.format 'Maarten', 9
+    expected = 'Maarten, you are the 9th customer we serve today. Thank you!'
+    assert.are.equal expected, result
+
+  pending 'format non-exceptional ordinal numeral 5', ->
+    result = LineUp.format 'Petronila', 5
+    expected = 'Petronila, you are the 5th customer we serve today. Thank you!'
+    assert.are.equal expected, result
+
+  pending 'format non-exceptional ordinal numeral 6', ->
+    result = LineUp.format 'Attakullakulla', 6
+    expected = 'Attakullakulla, you are the 6th customer we serve today. Thank you!'
+    assert.are.equal expected, result
+
+  pending 'format non-exceptional ordinal numeral 7', ->
+    result = LineUp.format 'Kate', 7
+    expected = 'Kate, you are the 7th customer we serve today. Thank you!'
+    assert.are.equal expected, result
+
+  pending 'format non-exceptional ordinal numeral 8', ->
+    result = LineUp.format 'Maximiliano', 8
+    expected = 'Maximiliano, you are the 8th customer we serve today. Thank you!'
+    assert.are.equal expected, result
+
+  pending 'format exceptional ordinal numeral 1', ->
+    result = LineUp.format 'Mary', 1
+    expected = 'Mary, you are the 1st customer we serve today. Thank you!'
+    assert.are.equal expected, result
+
+  pending 'format exceptional ordinal numeral 2', ->
+    result = LineUp.format 'Haruto', 2
+    expected = 'Haruto, you are the 2nd customer we serve today. Thank you!'
+    assert.are.equal expected, result
+
+  pending 'format exceptional ordinal numeral 3', ->
+    result = LineUp.format 'Henriette', 3
+    expected = 'Henriette, you are the 3rd customer we serve today. Thank you!'
+    assert.are.equal expected, result
+
+  pending 'format smallest two digit non-exceptional ordinal numeral 10', ->
+    result = LineUp.format 'Alvarez', 10
+    expected = 'Alvarez, you are the 10th customer we serve today. Thank you!'
+    assert.are.equal expected, result
+
+  pending 'format non-exceptional ordinal numeral 11', ->
+    result = LineUp.format 'Jacqueline', 11
+    expected = 'Jacqueline, you are the 11th customer we serve today. Thank you!'
+    assert.are.equal expected, result
+
+  pending 'format non-exceptional ordinal numeral 12', ->
+    result = LineUp.format 'Juan', 12
+    expected = 'Juan, you are the 12th customer we serve today. Thank you!'
+    assert.are.equal expected, result
+
+  pending 'format non-exceptional ordinal numeral 13', ->
+    result = LineUp.format 'Patricia', 13
+    expected = 'Patricia, you are the 13th customer we serve today. Thank you!'
+    assert.are.equal expected, result
+
+  pending 'format exceptional ordinal numeral 21', ->
+    result = LineUp.format 'Washi', 21
+    expected = 'Washi, you are the 21st customer we serve today. Thank you!'
+    assert.are.equal expected, result
+
+  pending 'format exceptional ordinal numeral 62', ->
+    result = LineUp.format 'Nayra', 62
+    expected = 'Nayra, you are the 62nd customer we serve today. Thank you!'
+    assert.are.equal expected, result
+
+  pending 'format exceptional ordinal numeral 100', ->
+    result = LineUp.format 'John', 100
+    expected = 'John, you are the 100th customer we serve today. Thank you!'
+    assert.are.equal expected, result
+
+  pending 'format exceptional ordinal numeral 101', ->
+    result = LineUp.format 'Zeinab', 101
+    expected = 'Zeinab, you are the 101st customer we serve today. Thank you!'
+    assert.are.equal expected, result
+
+  pending 'format non-exceptional ordinal numeral 112', ->
+    result = LineUp.format 'Knud', 112
+    expected = 'Knud, you are the 112th customer we serve today. Thank you!'
+    assert.are.equal expected, result
+
+  pending 'format exceptional ordinal numeral 123', ->
+    result = LineUp.format 'Yma', 123
+    expected = 'Yma, you are the 123rd customer we serve today. Thank you!'
+    assert.are.equal expected, result