Embedded Squishdoku:
On the whole 9x9 grid, place the digits 1-9 once in each row and column without repeats. The central 7x7 outlined region of the grid contains nine 3x3 boxes overlapping at the dotted lines. Digits must not repeat in a box.
Skyscraper Arrows: The digit on an arrow indicates the number of digits seen in that direction, for that effect, digits block any lower or equal digit from being seen.