There is no direct save for the crimson skull possible as there is no bed to save in between each phase!sorry to bother, but which save leads to the crimson skull fight?
If you just want to get to the fighting rooms use the "bed12" files.
If you want all fighting rooms cleared use the "bed13Gob_cat_torture_Medal_Harpy_Boss" file.
Only way to go directly to the crimson skull fight is by using the "InDevolopment" option from main menu!
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video at 00:10 to see where the hidden option is...Cheers