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Alphadoku PDF, 25x25 sudoku puzzles PDF to download

60,000 25x25 PDF to pick

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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Choose a puzzle pdf at random: 
Level:  Pdf button grid.
Forms:  Symmetric       Asymmetric 

Select a puzzle pdf or a solution pdf: 
Level:  Pdf button grid.
        (From 1 to 10,000)
Forms:  Symmetric       Asymmetric 
Grid:   Puzzle            Solution 

 Online impressions 

All our alphadokus are printable through the menu 25X25 SUDOKU and the link Print puzzles.

 Play Alphadokus online 

All our 25x25 sudoku puzzles are playable online through the menu 25X25 SUDOKU and the link Play puzzles.

 General principles 

All puzzles on this site have solutions available for downloading. They are all created by .

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 download 

• 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.

 Symmetric or asymmetric PDF 

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.

 Reproduction Rights 

All Alphadoku - 25x25 - puzzles of this web site are created by and these puzzles can be reproduced free on condition that the link to appears on every reproduced page.

alphadoku grid