Check of the grid at

The current grid is right and
has a unique solution.
AB
CD
EF
GH
IJ
KL
MN
OP
QR
ST
UV
WX
Y

Button verification of the grid
Button tip for a square
Button solution for a square
Button solution for the grid
Button Save the game.
Button Reload a game.
Button reset
Choose a new grid.
Button Back to Home.
Alphadoku, 25x25 sudoku puzzle: Enter a puzzle solution to solve and play online,
with check of the current solution of the grid.

You have three acceptable results:
 • The current grid is right and has a unique solution.
 • The current grid is false and has no solution!
 • Input Error with equal letters in row, colomn or area.