The final post-credits flash of green text on the screen is a cipher that translates to a real-world URL.
Film/Series: The Batman
Category: Hidden Message
Timestamp: 02:55:30
Instead of a traditional Marvel-style post-credits scene, Matt Reeves provided a literal riddle. A brief flash of the Riddler's green question mark is accompanied by a quick string of cipher symbols. When decoded using the cipher key established earlier in the film, it translates to the phrase "El Rata Alada." Typing "www.rataalada.com" into a real-world web browser took fans to an interactive website containing more puzzles and deleted scenes.
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