Such as  
mg_kohztec_course 
mg_kc_course_v1-1 
mg_mario_course_v1_2 
mg_office45_course 
mg_pharaohs_tomb2_go_v3   
It seems more players are on the mini-games sever when course maps are on, many players enjoy the difficulties and the satisfaction of completing the map. It also helps players with movement so they can get better at the game.