Castlevania: Symphony of the Night for Android
Cult action game with role-play elements and open world. The main hero whose name is Alucard goes to explore the huge castle of Dracula, hoping to destroy its sinister owner. This game is considered to be the starting point of the metroidvania genre.
The playing world has a pseudo open structure. In some areas the hero will get new abilities and items of outfit that will help him reach parts of the castle that were closed for him before, fenced with special mechanisms or magic barriers. There is also a system of upgrade in the game and different items of outfit from armor sets and cold weapons to magic cloak and amuletes. Each part of the castle is inhabited by unique enemies, and in some stages of the game the main hero will experience fierce battles with powerful bosses.