The tony_hawks_underground.challenge.gbx file you have requested: Maps Levels Missions / Tracks / Bay / Tony Hawk's Underground - 16.03kb is not available. Perhaps try browsing all files for the game TrackMania: Sunrise and upload any files you want to share or are missing. This is the only information we could locate:
A "skate" track (tony Hawk's) in the city (underground). Have fun For more information on TrackMania Sunrise, visit Trackmania.filefront.com A track inspired by the popular skating game "Tony Hawks Underground" this track consists of many half pipe style jumps. This map is very technical and is of intermediate difficulty.