A hidden spiderweb puzzle in Red Dead Redemption 2 went unnoticed for years. Just as players were making progress, they realized they may have missed its opening move: a seven-year-old pentagram mystery they had been treating as something separate.
Super Mario Bros. has been played and analyzed frame by frame since 1985, and its world record is just four frames short of the theoretical target. Yet in 2026, researchers found a way to run their own code inside the game — following a clue from an entirely different Mario title.
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