Addaven Jigsaw Challenge

Edit quiz as JSON array. Graded question: {"q":"...","opts":["a","b","c","d"],"correct":0}. Survey question (no right/wrong, just records the answer): {"q":"...","opts":["Yes","No"],"survey":true}

Every registration and every completed play is saved on this device automatically — this works even if no backend database is connected. Anything not yet synced to MySQL is retried automatically whenever the kiosk is online.