"It was just far too easy. I just had to put in dad's name, address, date of birth and card details and checked a box saying I was 18 — it took literally seconds to register and start gambling."
The debts went unnoticed at first as his dad's groundworks firm turns over about NZ$57,000 a month but a call from the bank six months later uncovered the fraud.
When confronted by his parents the boy immediately confessed to the deceit, which by this point stood at more than NZ$37,600.
He was sent for psychotherapy and they assumed he had learned his lesson.
But several months later he went on a week-long gambling binge and ran up debts of a further NZ$114,000.
His parents have said they will never be able to trust him again and they've been forced to take out loans to pay off the debts.
Their son, now 15, said: "I am sorry for what I have done. I feel like I've ruined everything and our lives will never be the same again."
The family decided to share their experience to warn others about the dangers of online gambling — no matter what age they are.