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Nice app..for .99 cent/100 yen you cant go wrong. I highly recommend it for the cost and features. Nice clear map, scaleable, and most underground route information. Easy to use and VERY convenient to have in your pocket for quick access. HOWEVER....the Namboku line ends at Akbane Iwabuchi? It continues on to Urawa Misono (as SAITAMA RAILWAY). What happened there? Also, there are several JR lines beside the Yamanote that intersect and connect inside of central Tokyo; Kehin Tohoku, Saikyo, Sobu/Chuo line are the most needed. If you could add a timetable list function in addition to cleaning up the missing lines mentioned, it would be a perfect 5. But maybe you could make a companion app for JR EAST Tokyo/Kanto and that would be AWESOME. *PLEASE* make a JR East app!

Akibaboy about Tokyo Metro