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 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). |