SIGIL running in Dosbox 0.74 with a copy of Ultimate DOOM from GOG
I'd recommend to just go with a source port, it'll be far less crashy.

1. Copy SIGIL.WAD and SIGIL_COMPAT.WAD to your DOOM directory
2. Mount your DOOM directory as C:\
3. Type "DOOM.EXE -file SIGIL.WAD SIGIL_~1.WAD"
4. When it launches SIGIL will appear as the third episode or just type "idclev31" to warp to level 1
5. Find many crashes :P

There is a major crash on level 1 (And all if it really) because of visplane limits if you look too far left in the very beginning. The furthest I've gotten is level 3, which is where it crashed in this video.

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