Climbing

The climb skill allows you to go places in the mud that non-climbers can not
reach, including some of the more interesting sites of PotP! You will find
these sites that require the climb skill as you explore the world. Once up
against the wall (literally!), simply climb in the direction you wish to go.
The harder and more technical the climb, the higher your climb skill must be
to have a chance of success. But having a rope in hand helps quite a bit,
and for the hardest of climbs, having some pitons in your inventory will help
even more (you need not hold the pitons, just keep them in inventory). Pitons
are used up in the climb; you can not retrieve them. The rope stays with you
and is not lost.

See also: help skill climb