Backup of your game at

No backup. The current solution is empty.
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 backup of your current game on your PC to continue it later.

You have three possible cases:

 •Saving the current grid in the directory of your choice.
  You will be able to resume the game in progress with the function: "Reload a game".

 •No backup. The current solution is false.
  Input Error with equal letters in row, colomn or area.

 •No backup. The current solution is empty.