is an unofficial mod to Mario Kart Wii adding over 200 new tracks to the game, as well as loads of extra features. It was developed by MrBean35000vr and Chadderz with the help of countless other track authors, translators and testers.
CTGP-R version 1.03 was released January 2014. It has been updated continuously since release.
To help prevent online cheating, the source code for version 1.03 is kept secret, but the source code for the previous version is available on Github.
More information about CTGP-R and Mario Kart Wii modding, including information about how to make your own custom tracks can be found at the Custom Mario Kart Wiiki.