Changes

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

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

Every rock destroyed has a chance to spawn a ladder, becoming more likely as there are less rocks remaining. If this is successful, a ladder will spawn and prevent further ladders spawning from rocks (however, in the Skull Cavern, there is a 20% chance that a shaft will spawn instead of a ladder, and this does not prevent further ladders/shafts spawning from rocks).

Every rock destroyed has a chance to spawn a ladder, becoming more likely as there are fewer rocks remaining. If this is successful, a ladder will spawn and prevent further ladders spawning from rocks. (In contrast, in the [[Skull Cavern]], there is a 20% chance that a shaft will spawn instead of a ladder, and this does not prevent further ladders/shafts spawning from rocks.)

Specifically: Every rock destroyed has a base chance of 2% to spawn a ladder. This is adjusted by [[Luck#Daily Luck|Daily luck]], increasing by 2.5% at best (0.5% of which is added by the [[Special Charm]]) or decreasing by 2% at worst. It is also adjusted by [[Luck#Luck Buffs|Luck Buffs]], for example food buffs add 1% for every point of Luck. A hypothetical player with max daily luck and +1 luck buff would therefore have a 2 + 2.5 + 1 = 5.5% base chance to spawn a ladder for each rock destroyed. The inverse of the number of rocks remaining (after subtracting the rock that was just destroyed) is added on top of that (''e.g.,'' if 5 rocks remaining then 1/5 = 0.2 or 20%, if 100 rocks remaining then 1/100 = 0.01 or 1%). If no enemies remain then another 4% is added.

Specifically: Every rock destroyed has a base chance of 2% to spawn a ladder. This is adjusted by [[Luck#Daily Luck|Daily luck]], increasing by 2.5% at best (0.5% of which is added by the [[Special Charm]]) or decreasing by 2% at worst. It is also adjusted by [[Luck#Luck Buffs|Luck Buffs]], for example food buffs add 1% for every point of Luck. A hypothetical player with max daily luck and +1 luck buff would therefore have a 2 + 2.5 + 1 = 5.5% base chance to spawn a ladder for each rock destroyed. The inverse of the number of rocks remaining (after subtracting the rock that was just destroyed) is added on top of that (''e.g.,'' if 5 rocks remaining then 1/5 = 0.2 or 20%, if 100 rocks remaining then 1/100 = 0.01 or 1%). If no enemies remain then another 4% is added.