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9x9 SUDOKU
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16X16 SUDOKU
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16X16 JIGSAW SUDOKU
16X16 CHAOS SUDOKU
25X25 SUDOKU
SAMURAI OF 5 GRIDS
SAMURAI OF 4 GRIDS

60,000  25X25 puzzles to choose from

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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Select a puzzle pdf or a solution pdf:
 Level: BeginnerConfirmedExpert Number:         (From 1 to 10,000) Forms:  Symmetric       Asymmetric Grid:   Puzzle            Solution

Printing:

Play online:

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

Directions:

All puzzles on this site have solutions available for downloading. 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.

• 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".

Symmetric and asymmetric puzzles:

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.

Free reproduction:

All Alphadoku - 25x25 - puzzles of this web site are created by 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.