diff --git a/src/game.rs b/src/game.rs
index 29aca99..bc9b173 100644
--- a/src/game.rs
+++ b/src/game.rs
@@ -1,10 +1,11 @@
-use crate::{Avatar, Dialogue, Ending, Item, Palette, Room, Sprite, Tile, Variable, mock};
+use crate::{Avatar, Dialogue, Ending, Item, Palette, Room, Sprite, Tile, Variable, mock, optional_data_line};
 use std::fs;
 
 #[derive(Debug, PartialEq)]
 pub struct Game {
     pub name: String,
-    pub version: f64,
+    pub major_version: u8,
+    pub minor_version: u8,
     pub room_format: u8, // this is "0 = non-comma separated, 1 = comma separated" apparently
     pub palettes: Vec<Palette>,
     pub rooms: Vec<Room>,
@@ -70,7 +71,8 @@ impl From<String> for Game {
         let segments: Vec<&str> = main.split("\n\n").collect();
 
         let name = segments[0].to_string();
-        let mut version: f64 = 1.0;
+        let mut major_version: u8 = 1;
+        let mut minor_version: u8 = 0;
         let mut room_format: u8 = 1;
         let mut palettes: Vec<Palette> = Vec::new();
         let mut rooms: Vec<Room> = Vec::new();
@@ -83,7 +85,10 @@ impl From<String> for Game {
             let segment = segment.to_string();
 
             if segment.starts_with("# BITSY VERSION") {
-                version = segment.replace("# BITSY VERSION ", "").parse().unwrap();
+                let segment = segment.replace("# BITSY VERSION ", "");
+                let parts = Game::version_from_string(segment);
+                major_version = parts.0;
+                minor_version = parts.1;
             } else if segment.starts_with("! ROOM_FORMAT") {
                 room_format = segment.replace("! ROOM_FORMAT ", "").parse().unwrap();
             } else if segment.starts_with("PAL") {
@@ -106,7 +111,8 @@ impl From<String> for Game {
 
         Game {
             name,
-            version,
+            major_version,
+            minor_version,
             room_format,
             palettes,
             rooms,
@@ -163,9 +169,9 @@ impl ToString for Game {
         }
 
         format!(
-            "{}\n\n# BITSY VERSION {}\n\n! ROOM_FORMAT {}\n\n{}\n\n",
+            "{}\n{}\n\n! ROOM_FORMAT {}\n\n{}\n\n",
             &self.name,
-            &self.version,
+            &self.version_line(),
             &self.room_format,
             segments.join("\n\n"),
         )
@@ -203,6 +209,20 @@ impl Game {
         self.tiles.push(tile);
         new_id
     }
+
+    fn version_line(&self) -> String {
+        format!("\n# BITSY VERSION {}.{}", self.major_version, self.minor_version)
+    }
+
+    fn room_format_line(&self) -> String {
+        optional_data_line("! ROOM_FORMAT", Some(self.room_format))
+    }
+
+    fn version_from_string(string: String) -> (u8, u8) {
+        let parts: Vec<&str> = string.split(".").collect();
+        assert_eq!(parts.len(), 2);
+        (parts[0].parse().unwrap(),parts[1].parse().unwrap())
+    }
 }
 
 #[test]
diff --git a/src/mock.rs b/src/mock.rs
index eddc7c7..496630f 100644
--- a/src/mock.rs
+++ b/src/mock.rs
@@ -188,7 +188,8 @@ pub fn room() -> Room {
 pub fn game_default() -> Game {
     Game {
         name: "Write your game's title here".to_string(),
-        version: 6.5,
+        major_version: 6,
+        minor_version: 5,
         room_format: 1,
         palettes: vec![
             Palette {