It is super simple.
In that hex editor for the snes debugger I posted change
rom to ram.
00:0086 Is the same as 7e:0086
00:0086 is where the value is stored for the current level
create a savestate right before you kill the 1st boss
kill the 1st boss and watch that value change at 00:0086 as it’s going to the next level
reload savestate kill 1st boss again and change the value at 00:0086 to something like 01, 02, 03..... and see what happens
You need to run a trace before the value at 00:0086 changes to catch the code that you need to edit
If you don’t know how to trace the code then thats when you come back here and say:
How do I run a trace to catch the code?
And someone will say.........
I can show you the path but it is you who must walk the path
You can do it