Sudoku Puzzles
I have been trying my hand at writing sudoku puzzles. Please try my puzzles and give me feedback!
Anti-RCB
This puzzle has a fog mechanic and can only be played online. Play the puzzle here!
Rules:
- Standard sudoku rules apply.
- Draw a single loop connecting orthogonally adjacent cells, which does not cross or overlap itself. No digit on the loop may be equal to its own row, column, or box number (in normal reading order).
- Under the fog, there are exactly 11 cells with a marker (either a circle or square). The loop can be split into exactly 11 non-overlapping segments, each of a different length and each containing one marker.
- Radius Cells: Marked cells indicate the number of cells along the loop between itself and the farthest cell on that marker's segment, including both the marked cell and the last cell. For example, if the segment were of length 4, with the marker on the second cell, then the marked cell must be a 3. Similarly, a length 1 segment's marked cell must be a 1, a length 2 segment's marked cell must be a 2, and a length 11 segment's marked cell must be 6, 7, 8, or 9, depending on where it is.
- The sum of a square's segment must be even, and the sum of a circle's segment must be odd.
- Correctly filling in digits will clear fog on that cell and possibly the fog in other parts of the puzzle.
The Puzzle (starting state, correctly place digits to reveal clues):
Sieving For Primes
Play the puzzle online here!
Rules:
- Standard 6x6 sudoku rules apply.
- Draw non-overlapping cages around groups of orthogonally connected cells. The sum of a cage is represented by "??" on its upper leftmost cell (the leftmost of the cells in the uppermost row). Each cage has a unique number of cells and a unique sum, and each cage sum is a 2-digit prime number. Digits may repeat within a cage.
- The sum of the digits along the negative diagonal is also a prime, and is not equal to any of the cage sums.
- Cells separated by Vs sum to 5. Not all Vs are necessarily given.
The Puzzle:
The Hourglass
Play the puzzle online here!
Rules:
- Standard sudoku rules apply.
- Antiknight: cells a knight's move away cannot contain the same digit.
- Parity lines: Adjacent cells along a red line must alternate parity (odd vs even).
- Thermometers: Digits along a thermometer strictly increase from the bulb to the tip.
- Arrows: Digits along an arrow sum to the digit in the attached circle.
- Kropki dots: Digits in cells joined by a black dot are in a 1:2 ratio. Not all dots are necessarily given.
The Puzzle:
The Name of the Rose
Play the puzzle online here!
Rules:
- Standard sudoku rules apply.
- Antiknight: cells a knights move away cannot contain the same digit.
- (Red) Parity lines: Adjacent cells must alternate parity (odd vs even) along red lines.
- (Blue) Region sum lines: Box boundaries divide blue lines into segments. Each segment on a line has the same sum. Different lines may have different segment sums.
- (Green) German Whispers: Adjacent digits along a green line must differ by at least 5.
The Puzzle:
Group Theory
This is now Part 4 of a series called Photocopied that you can view in its entirety here!
You have been gifted a large collection of puzzles from a friend. You sift through them looking for interesting ones and find a photocopy of a puzzle from an old book of puzzles. The original book is nowhere to be found and the photocopy is in black and white.
You can see the photocopy here:
You assume the original had a unique solution, but can you still reconstruct that solution? The rules below are listed for the entire section of puzzles, so you can't be sure whether all three line types actually exist in the puzzle.
Rules:
- Normal sudoku rules still apply.
- Renban: Digits along a purple line form a set of consecutive digits in any order.
- German whispers: Adjacent digits along a green line have a difference of at least 5.
- Equal-sum lines: Box borders divide a blue line into multiple segments which have the same sum. Different lines may have different sums.
What is the original solution to this puzzle?
I have transcribed the puzzle so that it is easier to play:
And finally, you can play it online here!
Parity Party
Play the puzzle online here!
Rules:
- Normal sudoku rules still apply.
- For each cell with arrows, the number in that cell is equal to either the total number of odd digits or even digits along the rows, columns, and diagonals pointed to by the arrows.
The Puzzle:
Archipelago
Play the puzzle online here!
Rules:
- Normal sudoku rules still apply.
- Color each square as either 'land' or 'water'
- Each contiguous orthogonally connected set of land cells forms an 'island'
- Similarly, each contiguous orthogonally connected set of water tiles forms a 'lake'
- The largest digit in each island is equal to the total number of cells in that island
- The smallest digit in each lake is equal to the total number of cells in that lake
- The leftmost cell of the uppermost row of each island or lake may contain a number corresponding to the sum of the digits in that island or lake. Note that not all lakes or islands necessarily have their sum displayed. The question mark indicates that that square is the top leftmost square of an island or lake, but no sum is given.
- A circled cell indicates that its digit is equal to the total number of land squares in its 2x4 region.
The Puzzle:
"Rainbow Rain"
Play the puzzle online here!
This is basically version 2 of my first puzzle, "Rain and Broken Mirrors". The break-in logic is identical, but now the remainder of the solve is harder (though it's basically a hard normal sudoku). The ruleset is also much cleaner and the puzzle is more aesthetic.
Rules:
- Normal sudoku rules still apply.
- Digits within a particular color must be in descending order from the top of the puzzle to the bottom.
- Digits must not repeat on any of the 6 marked diagonals.
The Puzzle:
"Mistyped"
Play the puzzle online here!
Rules:
- Normal sudoku rules still apply.
- Color exactly 9 squares, such that every region, row, and column contains exactly one colored square.
- The numbers next to a row or column indicate the sum of the digits along that row or column, starting from the cell closest to the number, up to but not including the colored square on that row or column.
- The number on the top left indicates the sum of the cells along that diagonal, up to but not including the first colored square in that diagonal, or the entire diagonal if there is no colored square on it.
- However, the setter of this puzzle made some typographical errors, and 4 of the numbers outside the puzzle are incorrect.
The Puzzle:
"Double Bubble"
Play the puzzle online here!
Rules:
- Normal sudoku rules still apply.
- Two digit numbers within tictacs are read as standard base 10 numbers, and are equal to the sum of the digits on the corresponding arrow. The red tictac and corresponding arrow are only red for avoidance of ambiguity, their rules are the same as for the gray tictacs.
- Cells separated by a white dot have a difference of exactly 1.
The Puzzle:
