Hint #1 - Bordering On Easier
If you can get part of the border early, you can add to it inward. If you can get a part of the border on the right (or bottom), it will be attached to the last number in the row (or column), and you can add to it to complete the number and then put an X to separate it from other numbers in the row (or column). The same thing works if you can get part of the border on the left (or top), and it being a part of the first number in the row (or column).
Hint #2 - Mirror, Mirror (On My Screen...)
Look at the numbers for the rows (to the left of the puzzle). Do all the numbers duplicate exactly (like "3 2 2 3"), duplicate with an odd number in the center (like "4 3 4"), or contain only a single odd number (like "7")? If every row meets one of these three conditions, you've got a puzzle that is mirrored down the center (the left half is a reflection of the right half). Go down the center and fill in your odd numbers and then you can take anything else you fill in on the left or right and put the reflection (the same thing but flipped over left to right) on the other side!
Hint #3 - Do The Math
Look for filler patterns. In a 15x15 puzzle, a 15 will obviously fill a row or column. A "7 7" will also fill a column because of the minimum 1 space in between (7 + blank + 7). Look for other patterns. Other patterns to fill a line in a 15x15 puzzle can include "3 3 3 3", "2 4 4 2", "1 1 1 1 1 1 1 1", etc.
Hint #4 - I Walk The Line
In the Multi-Picross game Picture Picross, the host draws a picture and the guest(s) try to solve it. When you correctly fill in a square, you'll see the line(s) drawn by the host in their actual drawing. Follow them to fill in other squares quickly if you know which way they're going.
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