I thought I'd finished it.
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DoYouKnowSly.com is a Sly Cooper website related specifically to the announcement and release of Sly Cooper: Thieves in Time. It currently redirects to the official Sly Cooper website, SlyCooper.PlayStation.com.
The background image had clues as to what may appear 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 is also a small pyramid that references an Egyptian episode that was cut from the final game.
Hovering the mouse pointer over El Jefe's cigar displays a window for entering a code. The code was IGPU79.
When the Treasure Design Contest began, DoYouKnowSly.com displayed the rules of the contest and allowed contestants to enter their designs.