It's not a remake or a remaster, but fans will be happy that 'Red Dead Redemption' will be playable on all current generation consoles.
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Red Dead Redemption no longer playable on PS4 or PS5
Red Dead Redemption 2 PS4 Version Will indeed work on the PS5. : r/rockstar
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Red Dead Redemption' is coming to PlayStation 5 via backwards, red dead redemption 2 ps5
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Best Red Dead Redemption settings for PS4 and PS5