It’s a ancient, mind-numbing technique called “each walkable tile is its own room”. 😅
In the dark area each bitsy-room has just one walkable tile with exits to other rooms in all valid directions. What appears to be one room with LOS is actually about 50 smaller rooms. It took a goofy amount of time to complete but I’m happy with the results.
I’m glad you liked the game! Thank you for taking the time to play!