A character (that has no inherent climbing speed) has to roll a Body STR - Check to see if they succeed in climbing. If they succeed, they can climb the steep surface at half their Movement Rate. The GM can decide if the roll should be repeated at the start of every turn. To climb, a character needs at least 1 free hand.

You can try to climb a large creature. If the creature isn't willing, you have to make a contested roll with Body Control to surpass their Body Control. Once you are on a creature, Attacks against it make 1.5 times damage. The creature can use 1 AP to repeat the contested Body - Check and on a success throw you off on an empty square up to 1 sq away.