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Nitfol is a Z-code interpreter and debugger, created in 1999 by Evin Robertson. The name comes from one of the Infocom spells.


  • Uses the Glk API for I/O.
  • Uses the Quetzal save format.
  • Supports versions 1 through 8 of Z-machine, version 6 partially.
  • Debugger feature based on the Unix GDB debugger.
  • Supports Blorb sound and music.
  • Unlimited undo and redo.
  • Typo correction.
  • Automatic map generation.
  • As of 0.6 version, it supports the Glulx, BTZ and ScottAdams/AdventureInternational formats.