The "Read puzzle" option in the File menu can be used to read grids stored in files. The files must be in the concise format shown below or the verbose saved puzzle format. Puzzles in the concise format need to be solved and this can take several seconds.

Note that you can make sure that the entered puzzle has only one solution by using the Check puzzle option in the File menu.

The notation used for puzzle entry may look forbidding but is actually simple and requires the smallest possible number of keystrokes.

Cell types    symbol/example
Solve cell         "*"   (a cell to be solved)
Blank cell         "."   (a padding cell)
Separator          ","
Sum across         "19"
Sum down           "23"
Sum both    "23/19" or "23\19"

Note that for cells which contain both a sum down and a sum across, the sum down must be written first i.e. in the left to right order as they appear in the grid. For example 23/19 defines a sum down of 23 and sum across of 19. The separator "," need only be used where it is essential to distinguish between the case of adjacent single digit numbers and the case of a double digit number. For example between two, three "2,3" and twenty three "23".