The Glulx Runtime Instrumentation Project (GRIP) provides debugging tools for authors of interactive fiction (IF) by building on the capabilities of the Glulx virtual machine.

GRIP has migrated to This site will no longer be updated.


  • An Inform 7 debugger
  • Inform 7 call stacks for problem messages
  • Floyd mode, for testing compatibility with command-line or MUD interpreters

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