The Side A Gemini Riddle requirement is as follows -
"Used the skip magician three times in "Hearts & Swords".
Hearts & Swords is the 12th mission in the game, battling the twin bosses. Just repeatedly drive yourself into walls, get hit, or fail a jump 3 times in a row, and you'll be asked if you want to skip this part by the Skip Magician. Agree to this, then repeat in 2 other points on this level, until this trophy pops.