in Haunted Castle's Japanese N Version, Getting a high score either soft resets itself or slows down performance shown here:
再現手順
Play the game until you reach a score that gets on the high score table.
Added by Tafoid:
A quick way to do this is to run the game with -debug, start the game and when the game start, paste: maincpu.pb@1912=9
That will change your score to 90000 and you can just fast forward emulation letting you take damage to game over.
If someone needs a save state, I can provide one.
追加情報
the bug doesn't occur on any other clone. Only akumajoun