Jellystone Jellystone is a three tower play unit which is a combination of Skylark and Zoiks. The platforms are triangular 900mm linked by an overhead ladder to a square 900mm platform. The platform levels rise to 1,200mm and the two remaining platforms are linked by a suspension bridge. Other activities are vertical and angled scramble nets, chunky rung ladder, ramp and rope, fireman's pole and stainless steel slide.