All of the "Classicvania" entries in the series are worth playing if you enjoy their mix of pinpoint platforming and precise hack 'n' slash action, but Rondo of Blood is certainly the best of them by a fair margin. Like its predecessors, this is quite a hard game, but its approach to difficulty is much more fair than the likes of Dracula's Curse or even Super Castlevania IV. (Except for the marathon five-stack boss rush near the end, but hey, nobody's perfect.) Also, though it lacks the expansive moveset of SCIV (8-way whipping, primarily), the game feels much more like "pure" Castlevania as a result. This is also one of the aesthetic high-points for this entire era of gaming, with an unparalleled soundtrack and some of the most beautiful pixel-art you'll see this side of Shovel Knight, etc. Generally, I tend to be a little bit disappointed when revisiting retro games that fans love to gush about, but Rondo of Blood is one of the few well-known "hidden gems" that actually lives up to the hype. If you can stand its difficulty, this is a must-play.