Ratings per arc (IMDB)

Romance Dawn
8.27 
Buggy's Crew Adventure Chronicles
6.20 
Reverse Mountain
7.50 
Diary of Koby-Meppo
6.70 
Goat Island
6.47 
Boss Luffy Historical Special
5.66 
Chopper Man Special
5.20 
Spa Island
6.63 
Toriko Crossover
5.20 
Toriko Crossover 2
5.30 
Toriko & Dragon Ball Crossover
5.60 
Caesar Retrieval
6.63 
Marine Rookie
6.83 
Cidre Guild
5.75 
Anime 20th Anniversary special
6.10 
Uta's Past
7.25