- Solve rows 5 and 6 from the Mathrax sudoku and the 6's in the Greater than sudoku. (Keep using the skyscraper clues and the adjacent sudokus).
- In which cells can the 6 still be placed in rows 5 and 6 of the Killer sudoku? And can the 6 therefore be placed on the arrow in row 2?
- At least how many skyscrapers can be seen from the clue in the 2nd row between the Clone and Arrow sudokus? Can the 6 be placed on the right cell of the yellow clone?
- Knowing these answers should give you the digits on the longest increasing line (without bifurcation).
- The top 3 sudokus could probably be solved first.

I hope this helps :)