diff --git a/src/main.rs b/src/main.rs
index e085b40..31802cd 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,4 +1,5 @@
 use std::fmt;
+use std::collections::HashMap;
 
 #[derive(Eq, PartialEq)]
 struct Colour {
@@ -27,7 +28,7 @@ struct Tile {
     animation_frames: Vec<Image>,
 }
 
-#[derive(Eq, PartialEq)]
+#[derive(Eq, PartialEq, Hash)]
 struct Position {
     room: String, // id. is room id int or base36 string?
     x: u8,
@@ -49,6 +50,7 @@ struct Sprite {
     position: Position,
 }
 
+/// avatar is a "sprite" in the game data but with a specific ID
 #[derive(Eq, PartialEq)]
 struct Avatar {
     animation_frames: Vec<Image>,
@@ -63,6 +65,29 @@ struct Item {
     dialogue: Option<Dialogue>,
 }
 
+#[derive(Eq, PartialEq)]
+struct Exit {
+    /// destination
+    room: String,  /// id
+    position: Position,
+}
+
+// same as a dialogue basically
+#[derive(Eq, PartialEq)]
+struct Ending {
+    contents: String,
+}
+
+#[derive(Eq, PartialEq)]
+struct Room {
+    id: String,
+    palette: String, /// id
+    name: Option<String>,
+    items: HashMap<Position, Item>,
+    exits: HashMap<Position, Exit>,
+    endings: HashMap<Position, Ending>,
+}
+
 #[derive(PartialEq)]
 struct Game {
     name: String,