Yes, Hungary is part of the Schengen Area; hence, with a Hungary visa, you can travel freely to other Schengen Countries without needing additional visas. You must not overstay. If you exceed the 90-day limit, it can lead to several serious consequences, such as:
- Fines and deportation: You may be required to pay a fine for the period you overstayed, or the authorities might deport you from Hungary.
- Re-entry ban: Depending on the duration of the overstay, you could be banned from re-entering Hungary or any other Schengen Area countries for several years.
- Legal consequences: In some cases, you may face legal action, especially if the overstay is significant.
- Difficulty in future visa applications: Overstaying can negatively affect your chances of obtaining visas in the future, not only for Hungary but also for other countries.
Therefore, it's crucial to leave Hungary before your visa expires. Please note that each country within the Schengen Zone may handle overstays differently, but the consequences are generally severe.