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A prototype version of the game dated to June 1991 had an isometric 3D overworld map that was redesigned to be a 2D map in the final game. This map screen also used a song that would get reworked as the Treasure Room theme in the same game.
The Cutting Room Floor article:
https://tcrf.net/Proto:Super_Castlevania_IV/Sound_%26_Music_Differences#Map_Screen_.2807.29
Video about cut content in the Castlevania series:
https://www.youtube.com/watch?v=a5MtDx8x-C4#t=955s
https://tcrf.net/Proto:Super_Castlevania_IV/Sound_%26_Music_Differences#Map_Screen_.2807.29
Video about cut content in the Castlevania series:
https://www.youtube.com/watch?v=a5MtDx8x-C4#t=955s
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Right next to the stairs near the final boss fight with Dracula, there is a invisible stair case that leads to a lot of Pot Roasts, Hearts, a Cross/Boomerang, a Double Shot and a Triple Shot.
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If you jump on any treasure chest in stage 9 255 times in a row, a pot roast will come out.
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