The X Factor twins have agreed to front a Christmas marketing campaign for the video games company in a deal worth £250,000, according to The Sun.
John and Edward Grimes are believed to be filming a video and posing for posters next week.
A source said: "They are still the number one choice for brands which appeal to kids. Nintendo have snapped them up for Christmas."
It was previously reported that the Planet Jedward duo have already amassed £1 million each.
The source continued: "The twins are pulling in £30k every time they turn up to parties and corporate gigs. Then they have record sales, a book deal, TV shows, sponsorship deals and a pantomime.
"But they don't spend any money. They live on tuna and sweetcorn and live at home when they are not in hotels."