The block_tower.challenge.gbx file you have requested: Tracks / Full Throttle / Block Tower - 25.42kb is not available. Perhaps try browsing all files for the game TrackMania Nations Forever and upload any files you want to share or are missing. This is the only information we could locate:
This is a 30-40 second track for TrackMania Nations Forever. The track features a turbo-accelerated straight up to a large half pipe through a tunnel leading onto the roof of a building. The player must then navigate off the roof leading inside the bulding, eventually leading them back outside to the finish line. GPS is featured for any players struggling with any point in the track. Small in game effects using the media part of track editor are also used.