Any character has a 2-in-6 chance to climb up a rough surface, adding Dexterity modifier, and -1 for each encumbrance level. This includes surfaces such as: normal rope, old masonry, standard cliff, wooden stockade, bare pole, etc.; otherwise apply one of the following:
- +2 for natural chimney or ship's rigging.
- +1 for knotted rope, tree, or rock with many ledges.
- -1 for well-kept masonry or smooth natural rock.
- -2 for smooth and slippery stone, or an overhang.
(Note that this is broadly compatible with the probabilities and categories given in the 1E Dungeoneer's Survival Guide, 2E PHB, and 3E PHB, but using the simpler OD&D mechanic on the six-sided die.)