diff --git a/2025/index.php b/2025/index.php
index 451a708..e57fbc7 100644
--- a/2025/index.php
+++ b/2025/index.php
@@ -4,6 +4,7 @@ require_once __DIR__ . '/vendor/autoload.php';
 
 use Aoc2025\Days\Day1;
 use Aoc2025\Days\Day2;
+use Aoc2025\Days\Day3;
 use Aoc2025\Services\Template;
 
 
@@ -43,6 +44,9 @@ $day_1_answer = $day_1->run();
 $day_2 = new Day2();
 $day_2_answer = $day_2->run();
 
+// Day 3.
+$day_3 = new Day3();
+$day_3_answer = $day_3->run();
 
 // Render the template.
 $template = new Template('main.html');
@@ -51,6 +55,8 @@ $substitutions = [
   'day_1_answer_2' => $day_1_answer['part_2'],
   'day_2_answer' => $day_2_answer['part_1'],
   'day_2_answer_2' => $day_2_answer['part_2'],
+  'day_3_answer' => $day_3_answer['part_1'],
+  'day_3_answer_2' => $day_3_answer['part_2'],
 ];
 $response = $template->render($substitutions);
 
diff --git a/2025/inputs/day_3_input.txt b/2025/inputs/day_3_input.txt
new file mode 100644
index 0000000..7255fca
--- /dev/null
+++ b/2025/inputs/day_3_input.txt
@@ -0,0 +1,4 @@
+987654321111111
+811111111111119
+234234234234278
+818181911112111
diff --git a/2025/src/Days/Day2.php b/2025/src/Days/Day2.php
index 211a085..c78f320 100644
--- a/2025/src/Days/Day2.php
+++ b/2025/src/Days/Day2.php
@@ -1,5 +1,7 @@
 <?php
+
 namespace Aoc2025\Days;
+
 use Aoc2025\Day;
 
 class Day2 extends Day {
diff --git a/2025/src/Days/Day3.php b/2025/src/Days/Day3.php
new file mode 100644
index 0000000..fdc08e1
--- /dev/null
+++ b/2025/src/Days/Day3.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace Aoc2025\Days;
+
+use Aoc2025\Day;
+
+class Day3 extends Day {
+
+  public function run() {
+    $input = $this->getInputFile('day_3_input.txt');
+
+    return [
+      'part_1' => 'tes',
+      'part_2' => 'hello',
+    ];
+  }
+}
diff --git a/2025/templates/main.html b/2025/templates/main.html
index d1590d3..e61b895 100644
--- a/2025/templates/main.html
+++ b/2025/templates/main.html
@@ -34,8 +34,8 @@
             <h2 class="bitcount fs-1">Day 3</h2>
           </div>
           <div class="card-body">
-            <p class="bold">Part 1:</p>
-            <p class="bold">Part 2:</p>
+            <p class="bold">Part 1: {{ day_3_answer }}</p>
+            <p class="bold">Part 2: {{ day_3_answer_2 }}</p>
             <button>View Code</button>
           </div>
       </div>