- 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.