TCCLP is one of the most well-known (and longest) custom level sets, made by Tyler Sontag. As there was already a TylerS1.dat, Tyler changed the name to the abbreviation, which stands for Tyler's Chip's Challenge Level Pack. The set has been in production since May 8, 2004, and contains 350 levels, making it the third largest behind PB Gourami Levelsets.zip and Jacques.dat.