The north-east ridge of Foel Goch. The Scrambles in Snowdonia Guide calls it a "thoroughly nasty scramble" and says "only those experienced in dangerous terrain should consider an ascent, and they would be wise not to bother". Follow the sharp-edged but grassy lower ridge to the notch below the steepening. Exit this up a very exposed knife edge with suspect rock, the crux at the top and not much in the way of runners or belays (or attempt to outflank the crux via loose ground to the right). Follow the easier-angled but still-loose ridge to the summit.