Awaken on an asteroid in deep space, underneath comets and giant stars. Designed for HTC Vive, Prologue introduces the critically-acclaimed world of Irrational Exuberance—a fever dream of interstellar interactions. Take the first step on a journey of risk, wonder and discovery.
All Reviews:
Very Positive (327) - 86% of the 327 user reviews for this game are positive.
Release Date:
Apr 5, 2016

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Notice: Requires one of the following virtual reality headsets: HTC Vive or Windows Mixed Reality. See the VR Support section for more info.

Play Irrational Exuberance: Prologue

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Recent updates View all (2)

March 17

Updated with performance fixes!

Irrational Exuberance: Prologue has just been updated, at long last. Performance should be much better and hitting rocks should no longer constantly drop to the compositor. Please kick the tires and let me know how it works for you by commenting here or using the feedback form on the desktop window, which will send your system specs. Thank you in advance!

There are a few other goodies. There is now code to help compensate for playing in smaller rooms, which was particularly a problem in the opening scene. We've also improved a few sound effects and given you a bit more time in each world, and a few other bits and bobs. Please try it out and let me know what you think.

One last note: thank you for being here. I've been away for some time working on various things, related to the future of Irrational and otherwise. I'll be monitoring the forums regularly, fixing bugs, and posting updates on various fronts, and can't wait to share more. Thanks again for playing!
8 comments Read more


“’re left with a transcendent piece of otherworldly beauty. It’s nothing like reality, and that’s wonderful.”
The Verge

“Designed around users' natural curiosity, the project allows people to pursue their own inclinations instead of waiting around for instructions, resulting in a truly immersive experience and a sense of creation and discovery.”

About This Game

Irrational Exuberance is an experiment to probe the possibilities of full room-scale VR and the HTC Vive, unfolding organically as you discover and engage with deep space phenomena. Prologue is the first taste of the galactic fantasy, delivering you to a lonely asteroid in deep space, underneath comets and giant stars. Irrational Exuberance has been an audience favorite at Sundance and the Kaleidoscope tour and praised as a defining VR experience by the media for its use of space, sense and setting.

The full release, scheduled for late-2016, will feature dramatic interactions, deeply-immersive moments, and impossible vistas.

  • UNCOMPROMISING DESIGN: Exclusively designed for room-scale VR interaction, Irrational Exuberance is a non-violent, organic experience that offers cinematic moments of space, solace and spectacle.
  • AMPLIFIED SENSES: A highly tuned, evocative spatial audioscape takes audiences to the surreal depths of space, from crumbling meteorites to chiming ephemera to the distant hum of stars.
  • HYPER PRESENT REALITY: Beautiful worlds, mysterious sensations, and nuanced interaction weave together to create a heightened sense and awareness of this alternate reality.
  • COMPREHENSIVE PREVIEW: A short, but impactful experience that foretells the events of the full Irrational Exuberance release.

System Requirements

    • OS: Windows 7 SP1 or newer
    • Processor: Intel® i5-4590 / AMD FX 8350 equivalent or greater
    • Memory: 4 GB RAM
    • Graphics: NVIDIA GeForce® GTX 970 / AMD Radeon™ R9 290 equivalent or greater
    • Storage: 300 MB available space
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