When solving a Picross puzzle in a 10 x 10 grid (most normal level puzzles), here are some tips for quickly filling in spots on the grid:

• If a column/row has a 10, you can automatically fill in the entire column/row.
• If a column/row has a 9, you can automatically fill in the center 8 blocks of that column/row.
• If a column/row has a 8, you can automatically fill in the center 6 blocks of that column/row.
• If a column/row has a 7, you can automatically fill in the center 4 blocks of that column/row.
• If a column/row has a 6, you can automatically fill in the center 2 blocks of that column/row.