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Henry Cavill’s Mustache Protocol Googlebook game is now ready to play
Nov 11, 2026 — 3:11 PM ET
- Google has released the final episode of its behind-the-scenes series following the development of Henry Cavill’s new game.
- The final episode focuses on Cavill putting the finishing touches on Mustache Protocol.
- Mustache Protocol is now available to play on the web.
Googlebooks offer a plethora of features, including various built-in AI tools like Magic Pointer, Rambler, and Antigravity. Shortly after the Googlebook launch earlier this year, the tech giant tapped Henry Cavill to build a game using only the tools available on his Googlebook. We learned last week that Cavill’s game is called “Mustache Protocol” and now it’s available for you to play.
Google has released the third and final episode of its behind-the-scenes series following the development of Mustache Protocol. In this episode, we see Cavill putting the finishing touches on the project. Specifically, he uses Continue On, Rambler and BandLab, and Antigravity to create the game’s theme song. This episode also serves as an announcement that the game is live starting today.

If you haven’t been keeping up with the development, Mustache Protocol is a retro-inspired 16-bit side-scroller. You play as a hero who has set out to stop rogue CGI artists from erasing every mustache on the planet. The game is also said to include “hilarious power-ups” and a number of Easter eggs.
Every play from November 11 to November 30, Google pledges to donate $11, up to $500,000, to Movember. The cause is designed to drive awareness and funding for men’s mental health, suicide prevention, prostate cancer, and testicular cancer.
Mustache Protocol is available on the web. It can be played on desktop with keyboard controls or on mobile. You can find the game on googlebook.com/henry.

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