I picked up the Castlevania Anniversary Collection on Steam. In probably some of the least-shocking news of the year, it's kind of flawed. The games mostly run fine but there are annoyances. For instance, you cannot re-map buttons and for the NES & Gameboy games you are stuck with (X-Box Controller) B & A as (Nintendo) A & B, respectively where X-Box A & X as A & B would be more conventional. The SNES & Genesis games are mapped more intuitively, but you can re-map in the game anyway. The sound is also kind of weird- it's very bass-heavy. In the original CV the percussion & bass is so loud the channel playing the melody is barely audible. It's a bit better in the other NES & Gameboy games but still prominent. CV4 is bass heavy and the sound crackles. The Genesis game sounds fine. It's $20 right now and I would recommend waiting for a sale or if these issues are fixed.