YPP- Duty Navigation (Theboosh)
D-nav is one of those puzzles voicing really wouldn't do much justice in learning. Though they're a couple quick tips that'll help you if you're a beginner in the puzzle. Speed is a factor an important factor. Taking your time to think and minimize any mistakes is beneficial. You have plenty of time before your piece drops again when having tough alignments. Try to also have every piece type in each row(obstructions with pieces you are not using for the clear and move and adjust your board is a great strategy).
Emerald Ocean
Theboosh