Out of the three NES Castlevania games, this one is the best. Set before the events of the first Castlevania, Dracula has started to ravage Europe, and the church has called the once-exiled Belmont clan to stop them. Now, taking on the role of Trevor Belmont, the wielder of the Vampire Killer whip in this story, you must save Wallachia.
Unlike the last game, SImon's Quest, which played like Metroid, Dracula's Curse goes back to the side-scrolling gameplay of the first Castlevania, which is a good thing. However, this game would improve upon it by adding three additional characters that you can switch Trevor out with during gameplay. However, you can only bring one ally, and each one has his or her own special abilities (Grant can climb walls and cielings, Alucard can turn into a bat, which consumes hearts, and Sypha uses elemental magic). Also, some parts of the game have branching paths, which will lead to different levels, making each playthrough different depending on choices made.
However, the game is hard as usual. Thankfully, the game does offer infinite continues, and if you get tired and need a break, also offers a password system, which is an improvement from Simon's Quest, as it now requires a name to be entered and a grid with certain items from the game filled in a certain way to continue where you left off. This is one game that must be played, and has been re-released multiple times (the recent one being the Castlevania Anniversary Collection).