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My buddy runs a grow-op and coined the name Riddler for this strain several years ago. The story is he received some seeds from a vendor but nobody knew what it was, so when he was growing it he marked the pots with a ?. Someone mentioned it reminded them of the Riddler from Batman, thus Riddler was born. Unless someone cross references the strain DNA, nobody will know what it actually is but it seems to have taken a life of its own. The OG grow-op it came from is The Library in San Bernadino, CA