Mining, i.e. exploring the Mine: what's the deal with multiple exits per level, any ruleset behind that?

[Homer Morisson]

Basically from below Level 5 onwards I kept getting levels with multiple exits, usually two, sometimes even three.

Visually they all look the same, no way to tell them apart, but is there some kind of logic behind them?

Are exits "dropped" by killed enemies different from exists found under a smashed boulder?

I'm not 100% sure, as it was late last night (or very early this morning) when I played last, but I think that one of those exits/staircases took me down more than just one level at a time, i.e. skipping a number of levels.

And one time, I ended up on an almost entirely dark map that had a blinking skull looking thing in the top left corner of the HUD... whatever that meant.

So:
Any logic behind all that, or totally random and thus unpredictable?

[.#𝚌𝚊𝚞𝚜𝚝𝚒𝚌]

From the wiki:

"Ladders can be dropped from Monsters[1], Rocks[2], or spawned on load[3]

Every monster killed has a flat 15% chance of spawning a ladder, assuming the enemy was killed over an unobstructed tile. This does not prevent ladders spawning from rocks.

Some levels are preloaded with a ladder (12, 52, 92, treasure floors in skull caverns). These ladders do not prevent ladders spawning from rocks.

After a level loads, there is a 95% chance that a ladder will try to spawn. A tile is chosen at random, and if it is unobstructed then a ladder is placed. This will prevent ladders spawning from rocks

Every rock hit has a base chance of 2% of spawning a ladder. This is adjusted by daily luck/5 (+/-10% / 5 = +/- 2%) and food buffs (every point of buff/100 i.e. each point of food buff adds 1%). The inverse of the number of rocks remaining after the rock is hit is added (e.g 5 rocks remaining - 1/5 = 0.2 = 20%, 100 rocks remaining = 1/100 = 0.01 = 1%). If no enemies remain then 4% is added. If this chance hits, then a ladder will spawn, and prevent further ladders spawning from rocks. If you are in the skull caverns there is a 20% chance that a shaft will spawn instead, and this does not prevent further ladders/shafts spawning from rocks"

Regarding the floors:

"The Mines consist of 120 floors or levels. These floors are divided into three sections, 40 floors each, with their own themes; the first section has a brown earth theme, the second section has an ice theme, the third and last section has a lava and dark purple theme. The last ten floors of each section has a variation of the main theme; the first section (Floor 31-39) has a shadow theme, the second section (70-79) has a castle theme, and the third section (110-119) has a darker crimson theme.

The corresponding floors in each section have the same layout. For example, Floor 1, 41, and 81 have the same layout; as does 2, 42, and 82; or Floor 10, 50, and 90; and so on."