Using the Zudoku Program
Working on a Puzzle
You can use either the keyboard or the mouse to work on your
puzzle in Solving Mode. Note that for each cell you can select one
"Solved" number, several "Possible" numbers, or several
"Impossible" numbers. The small numbers indicate if that digit is
"Unknown" (light gray), "Possible" (dark green), or
"Impossible" (light red). A large gray number indicates your solution
for that cell. A large black number means that it is a starting number and cant
be changed.
The small numbers can be ignored or simply used for your own
"notes" for easier puzzles. Strategies for more advanced puzzles
require the small numbers to accurately indicate all numbers known to be
impossible in cells.
For detailed descriptions of the strategies mentioned in
this section, refer to Strategy
Details.
Using the mouse:
This is the most intuitive. When the cell is not solved, all
of the small numbers show.
- Left-click on any number to set it to Possible, and
left-click on a Possible number to turn it back to Unknown.
- Right-click on any number to set it to Impossible, and
right-click on an Impossible number to turn it back to Unknown.
- Left double-click on any number to make it the solution.
- When solved, left-click the cell to turn the Solved number
into a Possible number, or right-click the cell to turn the Solved number
into an Impossible number. Other Possible/Impossible numbers are
remembered and will show themselves when a Solved number is Un-solved.
- Unlike Start Mode, the small numbers can only be selected
with the mouse when they are visible.
Using the keyboard:
Use the cursor or Tab keys to move to a cell you want to
change.
When the cell is not solved
- Pressing a number key on the number keypad makes it the
Solved number, and pressing it again returns it to Possible.
- Holding down the Alt key while pressing a number key makes
it Possible, and doing it again returns it to Unknown.
- Holding down the Ctrl key while pressing a number makes it
Impossible, and doing it again returns it to Unknown.
- Pressing the number 0 or the space bar on any cell clears
the cell (sets all numbers to Unknown).
When the cell is Solved
- Pressing any number changes the solved number to Possible.
- Holding down Alt while pressing any number changes the
Solved number to Possible.
- Holding down Ctrl while pressing any number changes the
Solved number to Impossible.
- Pressing the number 0 or the space bar on any cell clears
the cell (sets all numbers to Unknown).