It's been so, so long since I last played the NES Tecmo classic Solomon's Key and its 50+ levels of action puzzles. Revisiting it wasn't at the top of my gaming ambition list until finding a complete run-through in one life on YouTube today. This video's not technically a speed run, but completing the game without dying must be close to the minimum possible time.
 
Solomon's Key NES Complete in 1 life