Castlevania is overall a huge family of games made by a lot of different people with various graphics, gameplay and plots. My personal favourite is Lords of Shadow which was developed by MercurySteam and Kojima Productions and was published by KONAMI on the 5th of October 2010.
It’s an action adventure, hack and slash, single player game that revolves around Gabriel a Knight that tries to get to an order named the Lords of Shadow in order to resurrect his wife from death. But in his journey Gabriel meets a lot of monsters or enemies that he has to kill in order to get past them and reach the order.
This game also involves a lot of boss fights that are intense and always differ one from the other. It has parkour mechanics and an upgrading system where you can unlock different skills and moves and increase the maximum amount of health and mana you can have. It also has a power system which you unlock later on in the game allowing you to transform into two different morphs each one having different buffs from the other.
It’s a really fun game to play and it will be definitely be worth your money if you decide to buy it. But keep in mind that it has scenes of violence so I would suggest it to people who are at least 16+.