diff --git a/src/newtypes/gameplay_modes.rs b/src/newtypes/gameplay_modes.rs
index bda60af..4363208 100644
--- a/src/newtypes/gameplay_modes.rs
+++ b/src/newtypes/gameplay_modes.rs
@@ -1,10 +1,13 @@
 use super::common::flag;
 
+pub type ModeId=u32;
+pub type StageId=u32;
+
 #[binrw::binrw]
 #[brw(little)]
 pub struct StageElement{
 	pub header:u8,
-	pub stage_id:u32,
+	pub stage_id:StageId,
 	#[br(if(header&Self::JUMP_LIMIT!=0))]
 	pub jump_limit:Option<u8>,
 }