Climbing up and down

These are some general rules, they are intended to apply in most situations to allow for a quick resolution of of difficult up and down movement.

LEVEL (default)

Movement costs 5' per square.
No roll is needed.

UPHILL (stairs, hills, etc.)

Pay an extra 5' per square.
No Roll is needed.

DOWNHILL (stairs, hills, etc.)

Pay an extra 5' per square (just like uphill)
OR don't pay extra and roll Acrobatics DC 5 check at bottom, failure means you fall prone.

DIFFICULT TERRAIN

Difficult & level: Pay an extra 5' per square.
Difficult & uphill: Pay 15' per square.
Difficult & downhill: Pay 15' per square, or pay 5' per square & roll Acrobatics DC 10; failure means you fall prone.

CLIMB UP/DOWN

Unless you have a climb speed, each square of climbing movement, in any direction, costs 15'.
An Acrobatics check may be necessary for difficult balancing situations.
An Athletics check may be necessary for extended or particularly difficult climbs.

SWIMMING

Unless you have a swim speed, each square of movement costs 10'; 15' if encumbered (5x STR lbs).