How it works?

The mechanic is inspired by "The Binding of Isaac" dungeon generation described on wiki and in this video but it is not exactly the same.

First the game draws the number of rooms from 31 to 40, then the first room creates its door with 3/4 chance each. At all doors, the script generates rooms and then the process repeats itself. When the number of rooms drawn at the beginning is generated, the game creates a spawn point icon in the first room, in the last room boss icon, and in 4 from the end of the treasure icon.