A very thorough reassessment of the climbing on the south side of the A5, based around the ever-popular Tryfan & Cwm Idwal areas, including some 140 new routes climbed since the last guide, & many 'rediscovered' older climbs. The new routes are at all grades & on both old & new crags. Among the latter are the eastern Cliffs of Gallt yr Ogof, including Skyline Buttress, the location of some of the hardest climbing in Wales where the e 9 Mission Impossible has been the subject of much recent publicity.