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ZLR is a Z-machine implementation created in 2007 by Jesse McGrew. The name is a play on "CLR", the Common Language Runtime at the core of the .NET Framework.


  • Optimized for speed.
  • Strict separation between the virtual machine and I/O portions.
  • Uses the Quetzal save format.
  • Supports versions 5 and 8 of the Z-machine.
  • Multiple undo and redo.


  • Demona: uses a modified Gargoyle Glk library for I/O. Windows only.
  • ConsoleZLR: uses the standard .NET text console for I/O. Cross platform.