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A virtual machine designed by Andrew Plotkin which uses the Glk Application Programming Interface (API). The Inform language can be compiled for this virtual machine. Glulx imposes far less restrictive limitations on game size than the Z-machine and offers the I/O features of Glk, allowing Inform programmers to write larger games with more complicated user interfaces, without having to learn a new programming language.

Version History

  • 3.1.0: Added support for block operations and heap memory allocation. Games using Inform 7's "indexed text" or "list" functionality require an interpreter that supports 3.1.0.
  • 3.0.0: Added Unicode support.
  • 2.0.0: Added modular I/O system system. The default I/O system is no longer Glk, which makes this an incompatible change.
  • 1.0.0: Previous versions were all called "1.0.0"

How to play Glulx games

Glulx games can be played with a variety of interpreters. See the FAQ entry for links to the latest version of recommended interpreters for your platform.

Status of Interpreters

This table is up to date as of June 2008, at which time the most recent Glulxe was 0.4.3, the most recent Glulx VM was 3.1.0, and the most recent Glk was 0.7.0. It includes interpreters for major platforms only.

InterpreterSpatterlightZoomZagWindows GlulxeGitGargoyle1Filfre
PlatformsMac OS XMac OS X, UnixJavaWindowsWindows, UnixWindows, UnixWindows
AuthorTor AnderssonAndrew HunterJon ZeppieriDavid KinderIain MerrickTor AnderssonJimmy Maher
Version0. / 1.06n/a1.2.02006-09-170.98
Latest Release6/0811/073/0512/071/0812/0601/08
Glulxe version0.
Glulx VM version3.
Glk??CocoaGlk 1.0.4ZingWindows Glk 1.32Windows Glk 1.30GarGlk??
Glk Standard0. ??nonstandard??

1 Gargoyle can use either Git or Windows Glulxe to play games, and more recent patches have been made; this data refers to the standard configuration on the official Gargoyle website.

2 Partial; does not yet support malloc/mfree which is needed for some Inform 7 features.

See also

  • Glulxe, a Glulx interpreter
  • Git, another Glulx interpreter