Two lifelong friends have scooped a $12.36 million Lotto bonanza after winning the Big Wednesday draw last week.

The South Islanders bought their ticket at Whitcoulls St Lukes in Auckland and had a long-running habit of buying a ticket together each week.

The women wanted to remain anonymous but gave a hint of how they'd spend the money.

"Helping family and friends is at the top of the list for both of us," they agreed.

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But each winner also had their own dreams that could now perhaps become reality.

"I'm looking forward to indulging in a bit of travel. It's incredible to think that destinations we've always dreamed of visiting are now within reach," one winner said.

"I'm a big animal lover, so I want to use some of my winnings to help rescued animals. I'm so excited to be able to make much more of a difference," her friend said.

The ticket holders won $12,240,800 with Big Wednesday First Division and $120,473 with Big Wednesday Second Division. This took their total winnings to $12,361,273.

"This is the second major Big Wednesday prize won in 2015 and the eighth time a major jackpot has been struck this year," Lotto NZ spokeswoman Emilia Mazur said after the draw.