diff --git a/gc4ex.html b/gc4ex.html
new file mode 100644
index 0000000..0336595
--- /dev/null
+++ b/gc4ex.html
@@ -0,0 +1,510 @@
+<!DOCTYPE html>
+<html lang="en">
+    <head>
+        <meta charset="utf-8">
+        <title>Groove Coaster 4EX Modder</title>
+        <link rel="stylesheet" href="css/style.css">
+        <!-- don't hate -->
+        <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
+        <script type="text/javascript" src="js/FileSaver.min.js"></script>
+        <script type="text/javascript" src="js/dllpatcher.js"></script>
+        <script type="text/javascript">
+            window.addEventListener("load", function () {
+                new PatchContainer([
+                    new Patcher("game.exe", "game.exe (4.52)", [
+                        // for in memory patching, add 0x400c00 to file offsets to get virtual addresses
+                        {
+                            name: "Unlock all difficulties",
+                            patches: [
+                                // non-extra
+                                {offset: 0x298e0, off: [0x55, 0x8b, 0xec, 0x51, 0x89, 0x4d], on: [0xb8, 0xff, 0x00, 0x00, 0x00, 0xc3]},
+                                // extra
+                                {offset: 0x220d30, off: [0x55, 0x8b, 0xec, 0x51, 0x89, 0x4d, 0xfc, 0x8b, 0x4d, 0xfc, 0x81, 0xc1, 0xd4, 0x07, 0x00, 0x00, 0xe8, 0x5b, 0x0f, 0xdf, 0xff, 0x3b, 0x45, 0x08, 0x73, 0x04, 0x33, 0xc0, 0xeb, 0x14, 0x8b, 0x45, 0x08, 0x50, 0x8b, 0x4d, 0xfc, 0x81, 0xc1, 0xd4, 0x07, 0x00, 0x00, 0xe8, 0x60, 0xb7, 0xe1, 0xff, 0x8b], on: [0x8b, 0x44, 0x24, 0x04, 0x8b, 0x15, 0x54, 0xa5, 0x7d, 0x00, 0x66, 0x8b, 0x0d, 0x50, 0xa5, 0x7d, 0x00, 0x3b, 0x02, 0x74, 0x0e, 0x81, 0xc2, 0xb4, 0x00, 0x00, 0x00, 0x66, 0x49, 0x75, 0xf2, 0x31, 0xc0, 0xeb, 0x0b, 0x31, 0xc0, 0x83, 0x7a, 0x2c, 0x00, 0x0f, 0x95, 0xc0, 0x01, 0xc0, 0xc2, 0x04, 0x00]},
+                            ],
+                        },
+                    ]),
+                    new Patcher("stage_param.dat", "stage_param.dat (4.52)", [
+                        {
+                            name: "Unlock all songs",
+                            patches: [
+                                {offset: 0x26f, off: [0x00], on: [0x01]},
+                                {offset: 0x509, off: [0x00], on: [0x01]},
+                                {offset: 0x675, off: [0x00], on: [0x01]},
+                                {offset: 0x7ed, off: [0x00], on: [0x01]},
+                                {offset: 0x14e4, off: [0x00], on: [0x01]},
+                                {offset: 0x17d5, off: [0x00], on: [0x01]},
+                                {offset: 0x1d04, off: [0x00], on: [0x01]},
+                                {offset: 0x2af9, off: [0x00], on: [0x01]},
+                                {offset: 0x2b95, off: [0x00], on: [0x01]},
+                                {offset: 0x2c42, off: [0x00], on: [0x01]},
+                                {offset: 0x2d3d, off: [0x00], on: [0x01]},
+                                {offset: 0x2dce, off: [0x00], on: [0x01]},
+                                {offset: 0x2e77, off: [0x00], on: [0x01]},
+                                {offset: 0x2f39, off: [0x00], on: [0x01]},
+                                {offset: 0x2ff8, off: [0x00], on: [0x01]},
+                                {offset: 0x32cc, off: [0x00], on: [0x01]},
+                                {offset: 0x33b1, off: [0x00], on: [0x01]},
+                                {offset: 0x34ee, off: [0x00], on: [0x01]},
+                                {offset: 0x35cb, off: [0x00], on: [0x01]},
+                                {offset: 0x36b5, off: [0x00], on: [0x01]},
+                                {offset: 0x38a6, off: [0x00], on: [0x01]},
+                                {offset: 0x3960, off: [0x00], on: [0x01]},
+                                {offset: 0x3a2b, off: [0x00], on: [0x01]},
+                                {offset: 0x3af6, off: [0x00], on: [0x01]},
+                                {offset: 0x3c75, off: [0x00], on: [0x01]},
+                                {offset: 0x3d2e, off: [0x00], on: [0x01]},
+                                {offset: 0x3ddd, off: [0x00], on: [0x01]},
+                                {offset: 0x3ecd, off: [0x00], on: [0x01]},
+                                {offset: 0x4791, off: [0x00], on: [0x01]},
+                                {offset: 0x4879, off: [0x00], on: [0x01]},
+                                {offset: 0x4945, off: [0x00], on: [0x01]},
+                                {offset: 0x49f9, off: [0x00], on: [0x01]},
+                                {offset: 0x4b81, off: [0x00], on: [0x01]},
+                                {offset: 0x4c6a, off: [0x00], on: [0x01]},
+                                {offset: 0x4d69, off: [0x00], on: [0x01]},
+                                {offset: 0x4e24, off: [0x00], on: [0x01]},
+                                {offset: 0x4ed8, off: [0x00], on: [0x01]},
+                                {offset: 0x4f93, off: [0x00], on: [0x01]},
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+                                {offset: 0x5d52, off: [0x00], on: [0x01]},
+                                {offset: 0x5e16, off: [0x00], on: [0x01]},
+                                {offset: 0x5ee8, off: [0x00], on: [0x01]},
+                                {offset: 0x5fcb, off: [0x00], on: [0x01]},
+                                {offset: 0x614a, off: [0x00], on: [0x01]},
+                                {offset: 0x61fd, off: [0x00], on: [0x01]},
+                                {offset: 0x62c4, off: [0x00], on: [0x01]},
+                                {offset: 0x6386, off: [0x00], on: [0x01]},
+                                {offset: 0x647e, off: [0x00], on: [0x01]},
+                                {offset: 0x6572, off: [0x00], on: [0x01]},
+                                {offset: 0x664f, off: [0x00], on: [0x01]},
+                                {offset: 0x6712, off: [0x00], on: [0x01]},
+                                {offset: 0x67e8, off: [0x00], on: [0x01]},
+                                {offset: 0x68bb, off: [0x00], on: [0x01]},
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+                                {offset: 0x6c70, off: [0x00], on: [0x01]},
+                                {offset: 0x6dfb, off: [0x00], on: [0x01]},
+                                {offset: 0x6ed7, off: [0x00], on: [0x01]},
+                                {offset: 0x6fdb, off: [0x00], on: [0x01]},
+                                {offset: 0x70a3, off: [0x00], on: [0x01]},
+                                {offset: 0x724b, off: [0x00], on: [0x01]},
+                                {offset: 0x78f1, off: [0x00], on: [0x01]},
+                                {offset: 0x79a0, off: [0x00], on: [0x01]},
+                                {offset: 0x7a58, off: [0x00], on: [0x01]},
+                                {offset: 0x7b4b, off: [0x00], on: [0x01]},
+                                {offset: 0x7dcb, off: [0x00], on: [0x01]},
+                                {offset: 0x7ea1, off: [0x00], on: [0x01]},
+                                {offset: 0x7f6c, off: [0x00], on: [0x01]},
+                                {offset: 0x8048, off: [0x00], on: [0x01]},
+                                {offset: 0x8112, off: [0x00], on: [0x01]},
+                                {offset: 0x81e7, off: [0x00], on: [0x01]},
+                                {offset: 0x82a2, off: [0x00], on: [0x01]},
+                                {offset: 0x837f, off: [0x00], on: [0x01]},
+                                {offset: 0x8467, off: [0x00], on: [0x01]},
+                                {offset: 0x854c, off: [0x00], on: [0x01]},
+                                {offset: 0x85ff, off: [0x00], on: [0x01]},
+                                {offset: 0x86a4, off: [0x00], on: [0x01]},
+                                {offset: 0x873b, off: [0x00], on: [0x01]},
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+                                {offset: 0x91fa, off: [0x00], on: [0x01]},
+                                {offset: 0x92f6, off: [0x00], on: [0x01]},
+                                {offset: 0x9404, off: [0x00], on: [0x01]},
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+                                {offset: 0xabc8, off: [0x00], on: [0x01]},
+                                {offset: 0xad14, off: [0x00], on: [0x01]},
+                                {offset: 0xade1, off: [0x00], on: [0x01]},
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+                            ],
+                        },
+                    ]),
+                ]);
+            });
+        </script>
+    </head>
+    <body>
+        <h1>Groove Coaster 4EX Modder</h1>
+    </body>
+</html>
diff --git a/img/gc4ex.png b/img/gc4ex.png
new file mode 100644
index 0000000..9c66121
Binary files /dev/null and b/img/gc4ex.png differ
diff --git a/index.html b/index.html
index 5be3424..4b53e07 100644
--- a/index.html
+++ b/index.html
@@ -80,6 +80,12 @@
                     <div>Dance Dance Revolution A</div>
                 </div>
             </a>
+            <a href="gc4ex.html" class="gameicon">
+                <div>
+                    <img src="img/gc4ex.png">
+                    <div>Groove Coaster 4EX</div>
+                </div>
+            </a>
             <a href="gfdmv5.html" class="gameicon">
                 <div>
                     <img src="img/gfdmv5.png">
