This page contains a collection of links to official teaser websites for the 2008 Batman film, The Dark Knight. These "viral" websites contain many clues and hidden links, which reveal bits of information about the much anticipated film.

On April 1, 2008, the Joker left a cryptic message for viewers on the Clown Travel Agency website, which read:

• "Ready to have a ball? A special bag of fun awaits the first to claim it, but you'd better strike fast, there's no time to spare! "

Along with the message, the Joker left a list of locations for a scavenger hunt. Upon visiting these locations (which turned out to be bowling alleys), participants in the scavenger hunt were rewarded with a green and purple bowling ball that had a phone number inscribed on it, a cell phone and charger, a Joker card, and another message from the Joker.

When all of the locations were discovered, a new note appeared on the Clown Travel Agency site, stating:

• "Good job, Clowns! You've proven you're kingpin material, so I've got a job that's right up your alley. Head over to Acme Security Systems and see if you can disable a certain alarm system for me. The password is: needle. Be sure not to use a phony email address. It'll be OK?. I promise."

Upon visiting Acme Security Systems, participants get busted by Commissioner Gordon, and offered a chance to redeem themselves by joining the Gotham City Police Force.