While the Suica card is the most versatile IC (Integrated Circuit) card in Japan, it does not work literally everywhere, though it is accepted on almost all major transit networks. In 2026, Suica is part of a "Nationwide Mutual Use" network, meaning it works on trains and buses in almost all major cities, including Tokyo, Osaka, Kyoto, Nagoya, and Fukuoka. However, limitations exist in rural areas and on certain types of transport. You cannot use Suica for "continuous travel" between different IC regions; for example, you cannot tap in at a station in Tokyo and tap out at a station in Sendai—you must use the card within a single service area. Additionally, many small, rural bus lines and "scenic" regional trains still only accept cash or local paper tickets. While you can use Suica to pay for the "base fare" on some Limited Express trains, you still need a separate physical or digital supplemental ticket for the seat reservation. For shopping, Suica is nearly universal at convenience stores and vending machines, but it is less common at small, traditional "mom-and-pop" restaurants or local craft markets outside of the major metropolitan hubs.