This route ascends a crack up the south west face of Snowdon. After 200 feet of 5.7ish climbing, you top out into the main south rib of Snowdon. Continue up along the rib or traverse along the other ribs as you make your way up to the summit. Pick your own line. It is 4th and easy 5th but nothing harder than you choose after "the back up plan". There is plenty of 3rd.
Starting out, the South Rib is one of the steepest ways to access Snowdon's summit. There is a plethora of 5th class lines up the lower band of rock that are a rope length or so. After the first 200'+ foot initial start of "Back Up Plan" it is characteristic of the rest of the face. Back up plan is reached by hiking slightly around the west face and cutting up the South Ridge variation couloir, it is pretty obvious. It took the two of us about one hour and fifteen minutes to get to the climb from Andrew's Lake.
Small Stoppers, a set of cams micro to #3 Camalot tops, and a 60m rope. 10-14 slings, 10 were used on the FA, be ready for run outs, but there are not many.