DeviantArt user Elemental79 did a crazy job converting a screenshot from the classic SNES game Super Metroid into HD using only Photoshop. He recorded the whole procedure in this speed up video to show us how much work something like this needs.
He already did the same treatment with Doom, with similar, awesome results and we really hope there will be follow-ups.
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Super Metroid - Depths of Tourian - Photoshop Speed Art [YouTube]