Screen shot of a puzzle named "Die Zeit 28-7-05" (see title bar)
The black numbers are the givens (fixed numbers of the empty puzzle).
The orange numbers (2, 7,1) are already entered digits.
The square row 7/column 2 is selected and is displayed hatched. For better display the "adjacent" row, column and 3x3 field to the selected square is highlighted in light yellow.
In this screen shot a little help is switched on: squares with only 1 valid entry are bordered in green (e.g. row 5/ square 3). With the menu items of Option more (deeper) help may be switched on or off individually.
Screen shot with full help switched on:
The small green digits in the squares are digits which legally may be entered into a square.
Squares with only 1 legal digit to enter are framed green, squares with 2 possible entries yellow and squares with 3 legal digits magenta.
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