This is the main download page for Mario Kart: Second Circuit, the patches for versions 1.0 to 1.6(Old) require a rom with a CRC32 checksum of D47555BE, while 1.6A, the 10th birthday patch, requires a rom with a CRC32 checksum of 94E8127E.

Mario Kart DS N64 Circuit v1.0 July 11th, 2014; 1.95MB
Mario Kart DS N64 Circuit v1.1 July 14th, 2014; 1.98MB
Mario Kart DS N64 Circuit v1.2 August 1st, 2014; 4.15MB
Mario Kart DS N64 Circuit v1.3 August 11th, 2014; 4.33MB
Mario Kart DS N64 Circuit v1.4 November 21st, 2014; 7.78MB
Mario Kart DS N64 Circuit v1.5 July 11th, 2015; 6.17MB
Mario Kart DS N64 Circuit v1.51 February 11th, 2017; 6.33MB
Mario Kart DS N64 Circuit v1.6 (Old) June 25th, 2018; 11.9MB
Mario Kart Second Circuit v1.6A (10 Years) July 11th, 2024; 10.8MB (Latest Version)