It's been almost a week since a lucky Gisborne player won big with Lotto's Powerball but the winner is still nowhere to be found.

With a $6.5 million Powerball prize in the bank, the winner will have a wealth of options when it comes to deciding how to spend the winnings.

"Anyone who bought a Lotto ticket from Grant Bros. in Gisborne for last Saturday's draw should check their numbers, as they may be sitting on a winner," said Emilia Mazur, general manager corporate communications at Lotto NZ.

"Gisborne's lucky millionaire is just one step away from being able to turn their dreams into a reality. All they need to do is check their ticket."

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The lucky winner will be the country's fourth big winner so far this year, following a young Otago couple winning $18m in February, followed by an Auckland person winning $3.8m and a Christchurch man also picking up $3.8m, also both last month.

Anyone who purchased a ticket from Grant Bros. in Gisborne is encouraged to sign the back of the ticket and check it immediately at any Lotto outlet, online at MyLotto.co.nz or through Lotto NZ's ticket-checker app.

With properties in the area going for around $1.5 million, the winner would still have plenty left in the bank.

If living right on the beach isn't enough, the Powerball winner could also invest in a luxury motor yacht to explore Gisborne's beautiful coastline.

With three cabins and bathrooms, the Prestige 630 has more than enough space to keep the whole family comfortable while out at sea. Around $2.7 million, this yacht is the ultimate addition to the Powerball lifestyle.

The winner could shout their mates to a Premium Pass to Gisborne's iconic Rhythm and Vines festival, with premium gig access helping make it one to remember.

Players can phone Lotto on 0800 695 6886 if they want to enquire about the best way to claim a prize.