R-map is a mix of 2 or more normal maps, for example:
Map A: pattern 1, pattern 2a
Map B: pattern 1, pattern 2b
Both maps are compressed into just 1 map, called map R, when map R is played, the game randomly give you either map A or B to play, this results in the map has a random pattern 2, you can't just blindfold and clear it. An R-map is not repetive like normal maps, making it less boring and have more replay value, especially if it is from your fav song. The R-map itself can't be ranked but the maps it is made of can.
Map A: pattern 1, pattern 2a
Map B: pattern 1, pattern 2b
Both maps are compressed into just 1 map, called map R, when map R is played, the game randomly give you either map A or B to play, this results in the map has a random pattern 2, you can't just blindfold and clear it. An R-map is not repetive like normal maps, making it less boring and have more replay value, especially if it is from your fav song. The R-map itself can't be ranked but the maps it is made of can.