ROWS: Every row must contain all the images. There may not be any duplicate images in any row. In other words, there can not be any rows that are identical. The images that you see on the board at the beginning of the game are the "givens". They can not be changed. The remaining images on the right side are the images that you fill in to complete the row.
COLUMNS: Like the Sudoku rule for rows, every column must also contain all the images. Again, there may not be any duplicate images in any column. Each column will be unique as a result.