Castlevania II: Simon's Quest, JP version speedrun in
PB/WR as of 8/30/2018. This is played on NES hardware with an Everdrive. This run utilizes a new route crafted by expert CV2 speedrunner Burb and exploits a series of wrong warp glitches exclusive to the Famicom Disk System release of the game.
This run is very improvable and you should definitely make sure to check out many of the great runners in the CV2 community who will improve this run and other categories. https://www.speedrun.com/cv2sq
Watch Castlevania speedruns and other cool stuff live at / romscout
EDIT: This record has already been obsoleted. It lasted about 8 hours. Keep updated with new runs on the leaderboard link provided.