diff --git a/config.json b/config.json
index 4a708598..2cf0923e 100644
--- a/config.json
+++ b/config.json
@@ -692,6 +692,14 @@
         "prerequisites": [],
         "difficulty": 2
       },
+      {
+        "slug": "line-up",
+        "name": "Line Up",
+        "uuid": "ae91da04-ba1b-4d5b-91c5-5ba035e2ae2b",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 2
+      },
       {
         "slug": "roman-numerals",
         "name": "Roman Numerals",
diff --git a/exercises/practice/line-up/.docs/instructions.md b/exercises/practice/line-up/.docs/instructions.md
new file mode 100644
index 00000000..9e686ecb
--- /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 00000000..ea07268a
--- /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 00000000..7c842932
--- /dev/null
+++ b/exercises/practice/line-up/.meta/config.json
@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "meatball133"
+  ],
+  "files": {
+    "solution": [
+      "src/line_up.cr"
+    ],
+    "test": [
+      "spec/line_up_spec.cr"
+    ],
+    "example": [
+      ".meta/src/example.cr"
+    ]
+  },
+  "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/src/example.cr b/exercises/practice/line-up/.meta/src/example.cr
new file mode 100644
index 00000000..ebd968a3
--- /dev/null
+++ b/exercises/practice/line-up/.meta/src/example.cr
@@ -0,0 +1,17 @@
+module LineUp
+  def self.format(name : String, number : Int32) : String
+    number = case {number % 10, number % 100}
+             when {_, 11..13}
+               "#{number}th"
+             when {1, _}
+               "#{number}st"
+             when {2, _}
+               "#{number}nd"
+             when {3, _}
+               "#{number}rd"
+             else
+               "#{number}th"
+             end
+    "#{name}, you are the #{number} customer we serve today. Thank you!"
+  end
+end
diff --git a/exercises/practice/line-up/.meta/test_template.ecr b/exercises/practice/line-up/.meta/test_template.ecr
new file mode 100644
index 00000000..41a9d832
--- /dev/null
+++ b/exercises/practice/line-up/.meta/test_template.ecr
@@ -0,0 +1,10 @@
+require "spec"
+require "../src/*"
+
+describe "<%-= to_capitalized(@json["exercise"].to_s) %>" do
+<%- @json["cases"].as_a.each do |cases| %>
+    <%= status()%> "<%-= cases["description"] %>" do
+        <%= to_capitalized(@json["exercise"].to_s) %>.<%= cases["property"].to_s.underscore %>("<%= cases["input"]["name"] %>", <%= cases["input"]["number"] %>).should eq("<%= cases["expected"] %>")
+    end
+<% end %>
+end
diff --git a/exercises/practice/line-up/.meta/tests.toml b/exercises/practice/line-up/.meta/tests.toml
new file mode 100644
index 00000000..36fdf1d0
--- /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/spec/line_up_spec.cr b/exercises/practice/line-up/spec/line_up_spec.cr
new file mode 100644
index 00000000..e7b44f0d
--- /dev/null
+++ b/exercises/practice/line-up/spec/line_up_spec.cr
@@ -0,0 +1,80 @@
+require "spec"
+require "../src/*"
+
+describe "LineUp" do
+  it "format smallest non-exceptional ordinal numeral 4" do
+    LineUp.format("Gianna", 4).should eq("Gianna, you are the 4th customer we serve today. Thank you!")
+  end
+
+  pending "format greatest single digit non-exceptional ordinal numeral 9" do
+    LineUp.format("Maarten", 9).should eq("Maarten, you are the 9th customer we serve today. Thank you!")
+  end
+
+  pending "format non-exceptional ordinal numeral 5" do
+    LineUp.format("Petronila", 5).should eq("Petronila, you are the 5th customer we serve today. Thank you!")
+  end
+
+  pending "format non-exceptional ordinal numeral 6" do
+    LineUp.format("Attakullakulla", 6).should eq("Attakullakulla, you are the 6th customer we serve today. Thank you!")
+  end
+
+  pending "format non-exceptional ordinal numeral 7" do
+    LineUp.format("Kate", 7).should eq("Kate, you are the 7th customer we serve today. Thank you!")
+  end
+
+  pending "format non-exceptional ordinal numeral 8" do
+    LineUp.format("Maximiliano", 8).should eq("Maximiliano, you are the 8th customer we serve today. Thank you!")
+  end
+
+  pending "format exceptional ordinal numeral 1" do
+    LineUp.format("Mary", 1).should eq("Mary, you are the 1st customer we serve today. Thank you!")
+  end
+
+  pending "format exceptional ordinal numeral 2" do
+    LineUp.format("Haruto", 2).should eq("Haruto, you are the 2nd customer we serve today. Thank you!")
+  end
+
+  pending "format exceptional ordinal numeral 3" do
+    LineUp.format("Henriette", 3).should eq("Henriette, you are the 3rd customer we serve today. Thank you!")
+  end
+
+  pending "format smallest two digit non-exceptional ordinal numeral 10" do
+    LineUp.format("Alvarez", 10).should eq("Alvarez, you are the 10th customer we serve today. Thank you!")
+  end
+
+  pending "format non-exceptional ordinal numeral 11" do
+    LineUp.format("Jacqueline", 11).should eq("Jacqueline, you are the 11th customer we serve today. Thank you!")
+  end
+
+  pending "format non-exceptional ordinal numeral 12" do
+    LineUp.format("Juan", 12).should eq("Juan, you are the 12th customer we serve today. Thank you!")
+  end
+
+  pending "format non-exceptional ordinal numeral 13" do
+    LineUp.format("Patricia", 13).should eq("Patricia, you are the 13th customer we serve today. Thank you!")
+  end
+
+  pending "format exceptional ordinal numeral 21" do
+    LineUp.format("Washi", 21).should eq("Washi, you are the 21st customer we serve today. Thank you!")
+  end
+
+  pending "format exceptional ordinal numeral 62" do
+    LineUp.format("Nayra", 62).should eq("Nayra, you are the 62nd customer we serve today. Thank you!")
+  end
+
+  pending "format exceptional ordinal numeral 100" do
+    LineUp.format("John", 100).should eq("John, you are the 100th customer we serve today. Thank you!")
+  end
+
+  pending "format exceptional ordinal numeral 101" do
+    LineUp.format("Zeinab", 101).should eq("Zeinab, you are the 101st customer we serve today. Thank you!")
+  end
+
+  pending "format non-exceptional ordinal numeral 112" do
+    LineUp.format("Knud", 112).should eq("Knud, you are the 112th customer we serve today. Thank you!")
+  end
+
+  pending "format exceptional ordinal numeral 123" do
+    LineUp.format("Yma", 123).should eq("Yma, you are the 123rd customer we serve today. Thank you!")
+  end
+end
diff --git a/exercises/practice/line-up/src/line_up.cr b/exercises/practice/line-up/src/line_up.cr
new file mode 100644
index 00000000..942c310f
--- /dev/null
+++ b/exercises/practice/line-up/src/line_up.cr
@@ -0,0 +1,5 @@
+module LineUp
+  def self.format(name : String, number : Int32) : String
+    # Write your code for the 'LineUp' exercise in this file.
+  end
+end