Rules
You must find a picture with the numbers series in each rows and columns. A number means how many adjacent black boxes they are. Each series of black boxes are separated by one or more blank boxes. You can specify a blank box by hitting the CRTL key.
Step 1
At first, blacken and bleach the rows and columns where you have no choice.
Step 2
Find the evident boxes. For exemple : in the first row, there is a serie of three black boxes in a row of five boxes. So, the third box is logically black.
Step 3
Use information you have to complete the picross, do not forgot the blank boxes, it is also important than black boxes.
Step 4
Complete the picross by combining the preceding technics.