While the Suica card is one of the most versatile tools for navigating Japan, there are several key things it does not cover or support. Most notably, Suica (and other IC cards like Pasmo or ICOCA) only covers the base fare for transportation; it does not cover the limited express or Shinkansen (bullet train) surcharges. If you wish to ride a bullet train or a reserved-seat limited express, you must purchase a separate "Super Express" or "Limited Express" ticket in addition to the base fare. Furthermore, Suica cannot be used for long-distance bus travel (highway buses) that requires a reservation. It also has geographic limitations: you generally cannot use it to travel continuously between different IC regions (e.g., you cannot tap in at Tokyo and tap out in Osaka). Additionally, while it is widely accepted at convenience stores and vending machines, it is often not accepted at small, traditional shrines, temples, or very rural mom-and-pop shops that remain cash-only. Finally, it cannot be used for PiTaPa-specific discount schemes or as a replacement for specialized regional day passes that offer unlimited rides for a fixed price.