The fastest completion times recorded on GCN Bowser's Castle (v3.3) by CTGP-Revolution users as of 2024-04-20 09:05 UTC. There are 4 unique players represented across 15 records. The CTGP-Revolution track ID for this course is SLOT0C-A47D952286D1022CD872359BFCA85707C4CF26B3.
This is a custom track. The special slot ID used for this course is 0x0C and so the correct My Stuff file name for this track would be koopa_course.szs. The track may be available for download from Wiimm's CT archive at ct.wiimm.de/i/A47D952286D1022CD872359BFCA85707C4CF26B3.