Chris Cornell fans are on a mission.
The Soundgarden lead singer is releasing a new solo song, "Worried Moon," with a unique twist.
In order to find the song and other prizes -- including its handwritten lyrics and video of a conversation about the song's inspiration between Cornell and filmmaker Cameron Crowe -- fans have to complete a treasure hunt that starts on this website.
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Too busy to complete the hunt? We understand -- here's the song itself, premiering exclusively on Mashable.
The new song and treasure hunt are tied to the release of Higher Truth, Cornell's fifth studio album, set for a Sept. 18 release.
The singer tweeted out the first clue for the handwritten lyrics, asking fans to decipher which Higher Truth song is "the name of a commune in France."
Solve this clue to unlock handwritten lyrics to a new track from #HigherTruth http://t.co/MVMUyAvhVD pic.twitter.com/UzIDD8zvlp— Chris Cornell (@chriscornell) September 16, 2015
The second clue asks fans to rewatch the "Nearly Forgot My Broken Heart" lyric video and figure out what word is written on the rocket.
Solve the 2nd clue to unlock an exclusive video http://t.co/MVMUyAvhVD pic.twitter.com/1mq47bobp4— Chris Cornell (@chriscornell) September 16, 2015
The third hint, which unlocks the actual song, asks fans to pinpoint the exact time Chris's son shows up in the "Nearly Forgot My Broken Heart" video.
Solve the 3rd clue to unlock a new track from #HigherTruth http://t.co/MVMUyAdGx3 pic.twitter.com/w3gKhbr3fE— Chris Cornell (@chriscornell) September 17, 2015
Cornell is no stranger to complex song releases. Last year, Soundgarden gave away the song "The Telephantasm (Resurrection Remix)" for free -- but only if fans completed an online puzzle.