info about STANDALONE constant in compiled games

Author: boxrocket6803

docs/systems/game-exporting.md

@@ -2,7 +2,7 @@
 title: "Game Exporting"
 icon: "🧍"
 created: 2025-10-10
-updated: 2025-10-10
+updated: 2026-04-08
 ---
 
 # Game Exporting
@@ -16,6 +16,13 @@ You can choose to export your games as executables, so that you can put them on
 
 These games don't have the typical restrictions that platform games have - there's no whitelist for code, and you can use standalone-exclusive APIs.
 
+Games are compiled with an extra `STANDALONE` constant when exporting.
+```csharp
+#if STANDALONE
+//code that should only run in an exported game
+#endif
+```
+
 ## How to Export your Game
 
 Exporting your game is done through the Export Wizard.