Riddle Me This: When Does Batman's Enigmatic Cipher Hunt Become an ARG?

In August 2020, Warner Bros shared the first trailer for Robert Pattinson's debut as the caped crusader at DC FanDome. Attentive fans noticed that during that trailer, the Riddler carefully wrapped up a greeting card for Batman, posing an initial challenge: "What does a liar say when he's dead?" The card went on to say

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Riddle Me This: When Does Batman's Enigmatic Cipher Hunt Become an ARG?

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Riddle Me This: When Does Batman's Enigmatic Cipher Hunt Become an ARG?

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Riddle Me This: When Does Batman's Enigmatic Cipher Hunt Become an ARG?

新蝙蝠侠》电影彩蛋网页中的谜语答案是什么？ - 知乎