Nothing in the original Prince of Persia (1989) was invented from scratch. Everything was traced from something real.
Was reading Jordan Mechner's development journal from 1985–1989. The breakdown of where every piece of the game came from:
-- Running and climbing animations: his 15-year-old brother David, filmed in white clothes in the Reader's Digest parking lot in Chappaqua, NY. Mechner traced the VHS frame by frame.
-- The opening sequence: the first ten minutes of Raiders of the Lost Ark -- "an athletic hero in a dangerous environment."
-- The setting: One Thousand and One Nights.
-- The sword fight: six seconds of the Errol Flynn / Basil Rathbone duel from The Adventures of Robin Hood (1938), rotoscoped frame by frame into 6502 assembly.
-- The soundtrack: his dad, who was an amateur composer.
Mechner's own framing: "In all creative fields, innovation comes from combining things that haven't been put together before. If you immerse yourself too single-mindedly in your chosen art form, your work can easily become just a reflection of what others are doing in that field."
Translation for game devs: don't look at other games for reference. Look at films. Books. Family members in parking lots. The 1989 game that defined the cinematic platformer was assembled from movies and a 15-year-old.
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Wrote longer notes if anyone's curious: link in comments. The book gave me a serious push of energy -- sharing in case it does the same for someone here.