Glulx

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Glulx is a 32-bit portable virtual machine intended for writing and playing interactive fiction. It was designed by Andrew Plotkin to relieve some of the restrictions in the venerable Z-machine format. For example, the Z-machine provides native support for 16-bit integers, while Glulx natively supports 32-bit integers.

The Inform compiler, starting with version 6.30, can produce either Z-machine or Glulx story files. A Spanish interactive fiction development system called Superglus also uses Glulx.

Glulx uses the Glk API for input and output.

Despite being a better-adapted virtual machine for modern computing hardware and being just as accessible to developers, Glulx continues to lag behind the Z-machine in popularity, largely due to the comparative rarity of interpreters. The most popular interpreter for Glulx is Andrew Plotkin's Glulxe.

The MIME type for Glulx is "application/x-glulx".

File extensions are .ulx or .blb (for blorb packages).