It will be an unknown layout, but wet and squelchy has been guaranteed for the third annual McDonald's Mud Muster this Saturday, on the brand new course at the Shelter View Jetsprint Park in Upokongaro.
After the first two years at the Rangitikei Farmstay, organisers Sport Whanganui have brought the mud run a little closer to town, and the new course means experience will count for nothing among the 430 competitors, even if they have taken part before.
There were 530 of them at last year's event, following the 350 who took part in the first year.
Despite the drop in numbers, Sport Whanganui are marketing their mud run as the "premier" mud run of Wanganui, given Rangitikei Farmstay owners Andrew and Kylie Stewart held their own event on the original course in September, called "The Mudder".
For Sport Whanganui's version, events manager Rachel O'Connor is promising a "complete surprise" so even locals who regularly attend the jetsprints, and know what the water-course looks like, will have no idea what is in store.