diff --git a/src/main.rs b/src/main.rs
index ee6aeec..e455798 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -94,12 +94,19 @@ struct Room {
     endings: HashMap<Position, Ending>,
 }
 
-#[derive(PartialEq)]
+#[derive(Debug, Eq, PartialEq)]
+struct Variable {
+    id: String,
+    initial_value: i64,
+}
+
+#[derive(Debug, PartialEq)]
 struct Game {
     name: String,
     version: f64,
     room_format: u8,
     palettes: Vec<Palette>,
+    variables: Vec<Variable>,
 }
 
 fn test_image_chequers_1() -> Image {