diff --git a/Cargo.lock b/Cargo.lock
index f52d5fb9..08996c3c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -247,10 +247,6 @@ dependencies = [
  "wayland-client",
 ]
 
-[[package]]
-name = "cart-demo"
-version = "0.1.0"
-
 [[package]]
 name = "cc"
 version = "1.2.52"
diff --git a/Cargo.toml b/Cargo.toml
index f77766cf..32c7f5c4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,6 +2,5 @@
 members = [
   "crates/prometeu-core",
   "crates/host-desktop",
-  "crates/cart-demo",
 ]
 resolver = "2"
diff --git a/crates/cart-demo/Cargo.toml b/crates/cart-demo/Cargo.toml
deleted file mode 100644
index 546f75d1..00000000
--- a/crates/cart-demo/Cargo.toml
+++ /dev/null
@@ -1,6 +0,0 @@
-[package]
-name = "cart-demo"
-version = "0.1.0"
-edition = "2024"
-
-[dependencies]
diff --git a/crates/cart-demo/src/lib.rs b/crates/cart-demo/src/lib.rs
deleted file mode 100644
index b93cf3ff..00000000
--- a/crates/cart-demo/src/lib.rs
+++ /dev/null
@@ -1,14 +0,0 @@
-pub fn add(left: u64, right: u64) -> u64 {
-    left + right
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
-    }
-}
diff --git a/test-cartridges/color-square/manifest.json b/test-cartridges/color-square/manifest.json
new file mode 100644
index 00000000..cfa28c34
--- /dev/null
+++ b/test-cartridges/color-square/manifest.json
@@ -0,0 +1,9 @@
+{
+  "magic": "PMTU",
+  "cartridge_version": 1,
+  "app_id": 1,
+  "title": "Color Square",
+  "app_version": "0.1.0",
+  "app_mode": "Game",
+  "entrypoint": "0"
+}
diff --git a/test-cartridges/color-square/program.pbc b/test-cartridges/color-square/program.pbc
new file mode 100644
index 00000000..efaf9f1e
Binary files /dev/null and b/test-cartridges/color-square/program.pbc differ