There are two prevailing theories. First (and most boring) is that the picture is of Sans, Papyrus, and Clamgirl. More interesting is the “It’s Gaster!” theory. Gaster, if you’re unaware, is a hidden character in Undertale—and, the theory goes, the lost brother of Sans and Papyrus.



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https://www.rockpapershotgun.com/2016/01/23/undertale-patch-secrets/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:+rockpapershotgun/steam+(Rock,+Paper,+Shotgun:+Steam+RSS)


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