The alphadoku is a 25 X 25 squares sudoku, using the letters of the alphabet from A to Y.
You have 60000 grids presented in two forms and three levels.
Forms: Symmetrical or asymmetrical.
Levels: Beginner, confirmed and expert.
Each of our puzzles has only one solution. All our puzzles are solvable by a sequence of logical reasoning. No multiple choice or unfounded hypothesis is necessary to reach any solution.
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Download in PDF format
Many browsers cause problems because they fail to print the background, or because they print borders that do not correspond exactly to the screen display.
In this case you can download our grids as PDF files and then print them. You will get a faithful presentation of our 25x25 sudoku grids.
The alphadokus of sudoku-puzzles-online.com are downloadable through the menu 25X25 SUDOKU and the link Download pdf puzzles.
Play online
The 25x25 sudoku puzzles of sudoku-puzzles-online.com are playable online through the menu 25X25 SUDOKU and the link Play puzzles.
Basic principles
For maximum clarity and standardization, all our puzzles are printed in black and white, without shades of gray, color or images.
All puzzles on this site have solutions available for printing. They are all created by sudoku-puzzles-online.com .
Choice of puzzles: Our alphadoku were designed and graded so that at the same level the higher the puzzle number, the more difficult the solution with this nuance that in our classification, at equal levels and numbers, symmetrical puzzles are a little easier to solve than asymmetrical ones. Indeed, the symetrical ones have an additional constraint - precisely to be symmetrical - so they have fewer empty squares to solve. Also note that the aspect of difficulty is subjective, because different solving techniques suit different people.
Why play alphadokus: The 25X 25 puzzles also provide extra training for hardened competitors and fans of classic 9X9 sudoku.
Levels to print
• Statements "Beginner" are fully resolvable by "Inclusion" while admitting other methods.
• Statements "Confirmed" are fully resolvable by "Inclusion" and "Exclusion" while admitting other methods.
• Statements "Expert" are solvable by "Inclusion", "Exclusion" and "Pairs exclusive".
For more information about these three methods, identical to 9X9 sudoku, see: General help.
Asymmetric and Symmetric printing
An alphadoku puzzle, like a sudoku, is symmetrical when the squares that compose it are arranged equally around the central square known as the center of symmetry. This is only esthetic and does not change the resolution mode of the grid. Indeed it is the puzzle that is symmetrical and not the solution. However, the advantage of non-symmetrical puzzles is that, having one less constraint, they allow the elaboration of more difficult problems.
Example images:
• Symmetry: A simple problem.
• Asymmetry: A difficult problem.
Broadcast right
All 25 x 25 puzzles offered on this site are created by the web site sudoku-puzzles-online.com and these puzzles can be reproduced free on condition that the link to sudoku-puzzles-online.com appears on every reproduced page.
