Websites

Several Sly Cooper-related websites have existed throughout the years. Such sites were created in preparation for the release of a new game. They typically contained promotional content like minigames, images, videos and downloads. Although none of them are active as of 2024, archives exist through services like the Wayback Machine. However, due to the Flash-based nature of many of the websites, archives may only be semi-functional.

Official website
SlyCooper.PlayStation.com (alternatively SlyCooper.com) was the official website for Sly Cooper, owned and run by PlayStation. The site was founded in 2002 and most recently contained information about Sly Cooper: Thieves in Time, replacing DoYouKnowSly.com.

SlySchool.com
SlySchool.com was a website related specifically to the announcement and release of Sly Cooper and the Thievius Raccoonus in the PAL region.

SlyMask.com
SlyMask.com was a website that contained information about Sly 3: Honor Among Thieves, as well as having information on entering a contest to win a trip to Alcatraz. On the site was a web-integrated scavenger hunt that had readers searching for 12 "Sly masks." After finding all 12, the video "Goodbye My Sweet" was unlocked for viewing.

DoYouKnowSly.com
DoYouKnowSly.com was a website related specifically to the announcement and release of Sly Cooper: Thieves in Time. The background image of the site had clues as to what may have appeared in Thieves in Time, such as El Jefe's cigar, a samurai helmet, a genie's lamp, a cactus, time machine plans, a picture of the Eiffel Tower, an arrow and an animal skull from the ice age. There was also a small pyramid that referenced an Egyptian episode that was cut from the final game.

Hovering the mouse pointer over El Jefe's cigar displayed a window for entering a code. The code was IGPU79.

When the treasure design competition began, DoYouKnowSly.com displayed the rules of the contest and allowed contestants to enter their designs.