Played on and off casually for years, 100% solo,recently popped my dungeon cherry, things were looking up until i stumbled across players running Griffonrook run and joined in [ I wasn't prepared] :
GW2 Griffonrook Run Jumping puzzle guide - MMO Guides, Walkthroughs and News
Guild Wars 2 - Griffonrook Run Jumping Puzzle (Skyscale Lost achievement) - YouTube
GW2 Griffonrook Run Jumping puzzle guide - MMO Guides, Walkthroughs and News
Griffonrook Run (jumping puzzle) - Guild Wars 2 Wiki (GW2W)