The overall,well I would say that its a good game and like the only thing bad is when you try to use your sub-weapons near the stairs,you just go up the stairs sometimes.
The graphics is like NES style like I say but that's how its suppose to be like on every NES game.
Sound is great and has really good music like on the first level.
Addictiveness is well its a challenge but its a good game better then Castlevania 2 Simon's Quest
Story is like in all the other Casltevania games,You play as a Belmont and in this game,you play as Trevor Belmont, ancestor of Simon Belmont who has to defeat Dracula but has other people to help him like Alucard,son of Dracula who can turn into a bat,Sypha Belnades who can use magic spells and Grant who can climb on walls.
The depth,well when you meet the characters on the way,you can have options if you want them to join you or not so that's the depth.
Difficulty it is kinda hard like there is a stage that goes up and if your caught at the bottom of the screen,you die.
Now to wrap things up,Casltevania 3 is a good game but its hard but not harder then Casltevania 2 Simon's Quest,so I would play this game.