Secret Codes and Battleships is the fourth studio album from Australian singer-songwriter Darren Hayes.

Hayes documented the process through a series of "Making of" videos, in which snippets of several songs from the new album could be heard.

The four people who found the code each received a Collector's Edition of the album and a personal phone call from Hayes himself.

The third was found in Mermaid Inn in New York City, The fourth and final code was discovered in the Hummingbird Bakery in Notting Hill, London, UK.

Jon O'Brien of AllMusic was positive on the album and gave it three-and-half-stars out of five and called it "his most commercial since 2002 debut Spin" and wrote: "It remains to be seen whether Hayes is a little too late to win back the millions of fans who worshipped his previous wedding dance favorites, but by limiting his experimental tendencies and focusing on the kind of intelligent synth pop he does best, he's given himself a fighting chance.

"[1] Robert Copsey of Digital Spy praised the album, particularly for the instrumentality of the tracks and the falsetto of Hayes.

Jordy Kasko of The Tune, however, considered the album to be "sterile", and had also claimed that "Black Out the Sun" would have been a worldwide hit if it was performed by Leona Lewis, whom Hayes originally wrote the song for.

[2] Natalie Shaw of the BBC gave a somewhat positive review, praising Hayes for managing "the balance between sharp observations and effortless melodies".

The track "Bloodstained Heart" also made its debut on the ARIA Top 20 Australian Singles Chart at No.