We asked people how they'd spend their spend their Lotto prize money if they won big.

The Porirua $15m Lotto winner has honoured a pledge to give half to his mate, but with a catch or two.

"It's been an incredible week - even now it feels like I'm floating on cloud nine. I think I'll feel like this for a while yet," the man, who wants to stay anonymous, said on Wednesday.

As well as scooping the first ever Wednesday Powerball jackpot days before Christmas he also scored another $250,000 from Lotto First Division.

SUPPLIED The $15 million-winning Lotto ticket.

The new multi-millionaire is splitting his $15m with his best mate to honour a pact the pair made years ago.

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MONIQUE FORD Dipak Dubariya, Prajesh Patel and Nimesh Bhavsar of the Eastside Four Square & Lotto shop in Porirua where the $15 million-winning Lotto ticket was bought.

The winner told his lucky mate as soon as he could over one of their regular dinner and drinks catch-ups.

"I really wanted to surprise him, so I handed him a photocopy of my winning ticket and the slip of paper with $15 million printed on it. He looked at the paper, then at me with his mouth hanging open, pointing at the piece of paper. I just gave him the thumbs up and said, 'I won the big one and half of it's yours.'"

Understandably his mate, and now fellow multi-millionaire, was gobsmacked.

"He couldn't believe it and he kept saying 'you're joking, you're joking'. It was a really great moment."

But with fortune comes duty so when the winner gave his mate his hefty half it was under three conditions. These included looking after their mates, paying for them to all have a big "dream holiday", and helping out the community.

"He couldn't have been happier. Other than that he's just like me and is still working it out. All we know is it's going to make a real difference to both our families."

But the cash is not going to change the way the family celebrate the festive season.

"Family's the most important thing and that's not changing this Christmas. We'll be celebrating with family the same way we always do - there will just be more to celebrate."

There have already been some extra special early presents under the Christmas tree, with each of his siblings receiving a cheque for $250,000.

"They all opened their envelopes at the same time, then looked at me in surprise and I said 'Yip, I had the winning ticket'. There was a whole lot of celebrating after that."

The man's own Christmas stocking got pretty well stuffed this year too after treating himself to his dream car.

"I've always loved it, so why not? It's not every day you win Powerball."

TOP 5 LOTTO NZ PRIZES

* $36.8 million - Masterton, June 2009

* $33 million - Auckland, September 2013

* $28.7 million - Auckland, October 2010

* $27 million - Tauranga, September 2013

* $26.5 million - Te Kauwhata, March 2012