Double Fine Productions has made heavy metal video game Brütal Legend free for 666 minutes only to honor heavy metal legend Ozzy Osbourne, who died this week aged 76.

The Black Sabbath frontman passed away on July 22 just a few weeks after he performed at the Back to the Beginning farewell concert.

Osbourne voiced the character The Guardian of Metal in Brütal Legend. The character’s appearance and personality was based on Osbourne himself.

In a post on social media, the Microsoft-owned Double Fine said it had made Brütal Legend free on Itch.io. “But this incredible deal will only last for 666 minutes, as the prophecy foretold,” the studio continued. “So get yourself clicking, before it disappears like a demon in the night…”

Brütal Legend is Double Fine’s 2009 heavy metal-themed action adventure real-time strategy hybrid, which stars Jack Black as roadie Eddie Riggs. Brütal Legend was published by EA after Activision dropped the game, and Double Fine and Activision ended up in a legal battle over the publishing issues.

Ozzy Osbourne starred in the game itself alongside fellow metal icons Lemmy Kilmister, Rob Halford, and Lita Ford. Double Fine boss Tim Schafer selected over 100 metal songs to be included in the game.

Double Fine, which is busy developing Keeper for PC and Xbox, announced the deal at 4pm PT, which means it ends at 3am on Thursday, July 24.

Wesley is Director, News at IGN. Find him on Twitter at @wyp100. You can reach Wesley at wesley_yinpoole@ or confidentially at wyp100@proton.me.