Like any good Ninja it is unassuming at first.
Here is the main menu. But that's not all
there is to it...
enter the toughest known SuDoku puzzle and see
if we can
solve it. Just drag and drop the red numbers to
the puzzle cells. If you make a mistake just
double-click on the number and it disappears.
When finished, "Save" the puzzle and you're
ready to Solve it.
is, ready to go, we saved it as
"toughestknownpuzzle.txt". Shall we
try to Solve it ourselves, or will we admit
defeat and give it to
NINJA's mighty "Auto
to solve it manually. NINJA
gives us all the tools. First of all, notice
at this point in the "Moves" section at Row 2, Col
6 only the 4 can be played. And at 3,9
only the 6 can be played. When you Drag and Drop
numbers onto the board the moves are recorded
placed in the "History" section so you never
lose a move. But we don't even have to Drag
and Drop--we simply click on the buttons on the
bottom and NINJA
does it for us! Notice the checked moves in the
"History" section, these are "decision points"
where you had previously picked one of two
possible moves. If that path doesn't work out
you can go back to that point and pick the other one and continue.
almost thought we had it! We hit another dead
end and now we have to back up to the last
"decision point" and take the other path...no
problem with our NINJA...
Well, it turns out this
really was a tough one! It's probably
impossible to be solved by a human being. We
gave up and turned it over to
"Auto Solve," which
took only 6.9 seconds. (That's actually a long
time; most sols take less than a second.) Notice
that the "Moves" section is empty and the
"History" section is filled up. You can click on
the lower right button and delete--or
replace--the last move(s) and they will be
erased from the board and put back in the
"Moves" section, all the way to the beginning.
You can Save your puzzle at any time and/or
Print it out with its entire move history for
Why try to work another SuDoku
puzzle without it!
Get your NINJA today!