At the time it is finished, talk again for the Contractor and you'll acquire another Joy Jewel and obtain teleported back again on the Concept Park. Area the jewel in the transformation device to restore the rollercoaster, and after that you will have to build 3 carts for that experience. https://desertblockpuzzlegamedown87625.digitollblog.com/35731093/new-step-by-step-map-for-desert-block-puzzle-for-beginners