# Attach and choose a scope [Back to Lua 5.4](https://rustic-game-engine.pages.dev/markdown/scripting/lua.md). - **Global Startup Script**: one game-lifetime instance, started when Play starts. - **Scene Startup Script**: one scene-lifetime instance, started after globals when its `scene/{name}.scene` loads. - **Object Component Script**: one instance per attachment, created and removed with its object. Select the object and use **+ Add Component**, or drag the script from Explorer onto the viewport. Moving or renaming the `.lua` file in the editor is safe because the attachment holds its persistent Asset ID. Do not edit `config/scripts.ron`.