This is NOT a walkthrough for the entire level. It's a walkthrough for the final room (the map room). The map room is a bit involved. I think I'll just post the entire sequence here, so people playing through the entry can open the secret tags until they get up to where they are at.
The gist of it is that you need to return to the entrance and complete the level a different way.
Before you do that:
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×You need to restore to before you cleared 1N2E and beat that room in a specific way:
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×Kill enemies in this order: wubba, 3 tarbabies in any order, brain, wraithwing.
You must also do the ritual in a specific way:
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×Do it the same as before, only this time make sure that there is mud left in the room when you clear it. This will remove the green door from 2S2E. The ritual should convert the room as you are going through the secret passage for the first time, and the force arrow leading into the secret passage should be removed.
From the level entrance (using Pathway variable from in-game):
Pathway 1:
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×Return to the entrance. Returning here at any time will reset the Pathway variable to 1, so you can always start over.
Pathway 2:
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×Enter 1E.
Pathway 3:
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×Enter 1N1E by going past the stalwarts. If wraithwings do not spawn in 1E you need to clear 1N2E in a specific way (see prep, above) and then return to the entrance and start the sequence over.
Pathway 4:
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×Enter 1E by going through the green door in 1N1E. If you do not enter using the rightmost column you will have to start the sequence over from Pathway 1. Specifically, you need to enter the room on tile (20,0).
Pathway 5:
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×Enter 1S1E by going South. Again, you need to enter the room on tile (20,0). If you have not yet cleared 1S1E you will have to clear it to drop the green door and then go back to Pathway 1.
Pathway 6:
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×Enter 1E using the rightmost entrance (any of the tiles should be fine).
Pathway 7:
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×Enter 2E.
Pathway 8:
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×Enter 1S2E.
Pathway 9:
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×Enter 2S2E through the secret passage.
Pathway 10:
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×Enter 1S2E from the regular entrance.
Pathway 11:
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×Enter 2S2E from the regular entrance.
Pathway 12:
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×Enter 1S2E through the secret passage.
Pathway 13:
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×Enter 2E.
Pathway 14:
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×Enter 1N2E.
Pathway 15:
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×Enter 2N2E.
Pathway 16:
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×Enter 1N2E.
Pathway 17:
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×Enter 2E.
Pathway 18:
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×Enter 1E.
If Pathway is equal to 18 at this point:
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×Return to entrance and exit it to the West.
Note that at any point entering a room other than the room specified will reset your Pathway variable and you'll have to go back to the entrance and restart from Pathway 1.
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106th Skywatcher