The New Sudoku Players' Forum

[ixsetf]

Here are a few puzzles I have made recently which I think are worth posting. Hopefully this thread doesn't become too messy.

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Puzzle 1 has near symmetry of givens and three versions with varying difficulty.

Puzzle 1 Normal: Show

Code: Select all

+-------+-------+-------+
| 1 . . | . . 6 | 7 . . |
| . 2 . | . 5 . | . 6 . |
| . . 3 | 4 . . | . . 9 |
+-------+-------+-------+
| . . 4 | 3 . . | . . 7 |
| . 5 . | . 2 . | . 8 . |
| 6 . . | . . 1 | 9 . . |
+-------+-------+-------+
| . . . | . . 9 | 1 . . |
| . . . | . 8 . | . 2 . |
| . . . | 7 . . | . . 3 |
+-------+-------+-------+


SE: 7.2
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Puzzle 1 Hard: Show

Code: Select all

+-------+-------+-------+
| 1 . . | . . 6 | 7 . . |
| . 2 . | . 5 . | . 6 . |
| . . 3 | 4 . . | . . . |
+-------+-------+-------+
| . . 4 | 3 . . | . . 7 |
| . . . | . 2 . | . 8 . |
| 6 . . | . . 1 | 9 . . |
+-------+-------+-------+
| . . . | . . 9 | 1 . . |
| . . . | . 8 . | . 2 . |
| . . . | 7 . . | . . 3 |
+-------+-------+-------+


SE: 8.4
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Puzzle 1 Harder: Show

Code: Select all

+-------+-------+-------+
| 1 . . | . . 6 | 7 . . |
| . 2 . | . 5 . | . 6 . |
| . . 3 | 4 . . | . . . |
+-------+-------+-------+
| . . 4 | 3 . . | . . 7 |
| . 5 . | . 2 . | . 8 . |
| 6 . . | . . 1 | 9 . . |
+-------+-------+-------+
| . . . | . . . | 1 . . |
| . . . | . 8 . | . 2 . |
| . . . | 7 . . | . . 3 |
+-------+-------+-------+


SE: 9.0
Play this puzzle online.



Puzzle 2 replicates patterns shared by the top 5 hardest puzzles, but is fairly simple to solve.

Puzzle 2: Show

Code: Select all

+-------+-------+-------+
| 1 7 . | . . . | . . . |
| . 2 . | 1 . . | . . 8 |
| . . 3 | . . 5 | . 9 . |
+-------+-------+-------+
| . . . | 4 . . | 7 . . |
| . . . | . 5 . | . 8 . |
| . . 5 | . . 1 | . . 9 |
+-------+-------+-------+
| . . . | 7 . . | 4 . . |
| . 6 . | . 8 . | . 5 . |
| 4 . . | . . 9 | . . 7 |
+-------+-------+-------+


SE: 6.6
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Puzzle 3 has many mini-diagonals and two empty boxes. Expect solving to be tricky.

Puzzle 3: Show

Code: Select all

+-------+-------+-------+
| 1 . 5 | . . 7 | . . 6 |
| . 2 . | . 8 . | . 5 . |
| . . 3 | 9 . . | 4 . . |
+-------+-------+-------+
| . . 9 | 4 . . | . . . |
| . 8 . | . 5 . | . . . |
| 7 . . | . . 6 | . . . |
+-------+-------+-------+
| . . 6 | . . . | 1 . . |
| . 5 . | . . . | . 2 . |
| 4 . . | . . . | 7 . 3 |
+-------+-------+-------+


SE: 8.5
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Puzzle 4, for this one I honestly don't remember why or how I made it, but it is difficult and irregular.

Puzzle 4: Show

Code: Select all

+-------+-------+-------+
| . . . | 4 . 9 | 2 . . |
| . 2 . | 1 6 . | 9 3 . |
| . . . | . . 7 | . 1 4 |
+-------+-------+-------+
| . . . | . 1 . | 8 . . |
| . 6 1 | . 5 . | . 9 . |
| . . 7 | . . 6 | . . 1 |
+-------+-------+-------+
| 9 1 . | 8 . . | . . . |
| . 3 . | . . . | 1 8 . |
| . . . | . . . | . . 9 |
+-------+-------+-------+


SE: 9.0
Play this puzzle online.



Puzzle 5 like the second puzzle uses patterns from the hardest sudoku, and while it is still significantly easier than those puzzles, it is much harder than puzzle 2. There are two versions, which I titled 'Clean' and 'Dirty'. Clean is closer to the pattern I was looking for, and Dirty is slightly harder.

Puzzle 5 Clean: Show

Code: Select all

+-------+-------+-------+
| 2 6 . | . . . | 5 . . |
| 3 . . | . . . | . . 2 |
| . . 7 | . 5 . | 1 . . |
+-------+-------+-------+
| . . 4 | 1 . . | 7 . . |
| . . . | . 2 . | . 8 . |
| . . . | . . 3 | . . 9 |
+-------+-------+-------+
| . . . | 7 . . | 4 . . |
| . 7 . | . 8 . | . 5 . |
| 4 . . | . . 9 | . . 6 |
+-------+-------+-------+


SE: 8.8
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Puzzle 5 Dirty: Show

Code: Select all

+-------+-------+-------+
| 2 6 5 | . . 1 | . . 7 |
| 3 . . | . . . | 5 . 2 |
| . . 7 | . 5 . | 1 . . |
+-------+-------+-------+
| . . 4 | 1 . . | 7 . . |
| . . . | . 2 . | . 8 . |
| . . . | . . 3 | . . 9 |
+-------+-------+-------+
| . . . | 7 . . | 4 . . |
| . 7 . | . 8 . | . 5 . |
| 4 . . | . 1 9 | . . 6 |
+-------+-------+-------+


SE: 9.0
Play this puzzle online.



Puzzle 6:

Puzzle 6: Show

Code: Select all

+-------+-------+-------+
| 1 4 . | . . 3 | . 2 . |
| . 2 . | 1 . . | . . 3 |
| . . 3 | . 2 . | 1 . . |
+-------+-------+-------+
| . . 9 | 4 . 8 | . . . |
| 7 . . | 9 5 . | . 8 . |
| . 8 . | . 7 6 | . . 9 |
+-------+-------+-------+
| . . . | 7 . 5 | 4 . . |
| . . . | 6 8 . | . 5 . |
| . 5 . | . 4 9 | . . 6 |
+-------+-------+-------+


SE: 8.5
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Puzzle 7, diagonal symmetry of givens pattern. It is similar in form to the puzzle posted in A different kind of symmetry.

Puzzle 7: Show

Code: Select all

+-------+-------+-------+
| . . . | 3 . . | 7 . . |
| . 2 . | . 5 . | . 8 . |
| . . . | . . 6 | . . 9 |
+-------+-------+-------+
| 7 . . | . . . | 1 . . |
| . 8 . | . 6 . | . 2 . |
| . . 9 | . . . | . . 3 |
+-------+-------+-------+
| 4 . . | 7 . . | . . . |
| . 5 . | . 8 . | . . 7 |
| . . 6 | . . 9 | . 5 1 |
+-------+-------+-------+


SE: 9.0
Play this puzzle online.



Puzzle 8 may have a relatively low SE but I expect finding a short solution to be challenging.

Puzzle 8: Show

Code: Select all

+-------+-------+-------+
| 1 . . | 5 . . | 2 . . |
| . 2 . | . 6 . | . 3 . |
| . . 9 | . . 7 | . . 4 |
+-------+-------+-------+
| 5 . . | . . . | 8 . . |
| . 6 . | . 5 . | . 9 . |
| . . 7 | . . 6 | . . 1 |
+-------+-------+-------+
| . . . | 8 . . | . . . |
| . 3 . | . 9 . | . 8 . |
| . . . | . . 1 | . . 9 |
+-------+-------+-------+


SE: 7.3
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Puzzle 9 like puzzles 2 and 5 was based on patterns in the hardest puzzles

Puzzle 9: Show

Code: Select all

+-------+-------+-------+
| 9 1 . | . . . | . . . |
| 3 . . | . . . | . . 2 |
| . . 7 | . 5 . | 1 . . |
+-------+-------+-------+
| . . . | 1 . . | 7 . . |
| . . . | . 2 . | . 8 . |
| . . 8 | . . 3 | . . 9 |
+-------+-------+-------+
| . . 2 | 7 . . | 4 . . |
| . 9 . | . 8 . | . 5 . |
| 4 . . | . . 9 | . . 6 |
+-------+-------+-------+


SE: 8.3
Play this puzzle online.

[Leren]

Puzzle 1 Easy version has a single stepper;

Code: Select all

*--------------------------------------------------------------*
| 1     489   589    | 289   39    6      | 7    c34    2458   |
| 4789  2     789    | 89-1  5    S378    |c348   6    c148    |
| 578   6     3      | 4    b17    278    | 258   15    9      |
|--------------------+--------------------+--------------------|
| 289   189   4      | 3     69    58     | 256   15    7      |
| 379   5     179    | 69    2     47     | 346   8     146    |
| 6     378   278    | 58    47    1      | 9     34    245    |
|--------------------+--------------------+--------------------|
| 23458 348   2568   | 256   346   9      | 1     7     4568   |
| 34579 13479 15679  |a156   8    a345    |a456   2    a456    |
| 2458  148   12568  | 7     146   245    | 4568  9     3      |
*--------------------------------------------------------------*

3 Petal Death Blossom: Stem Cell r2c6 {378};

 (1=3) r8c4679     - (3) r2c6;

 (1=7) r3c5        - (7) r2c6;

 (1=8) r1c8, r2c79 - (8) r2c6; => - 1 r2c4; stte

Leren