Japanese Sums by Serkan Yürekli

Japanese Sums by Serkan Yürekli

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Theme: Sum of 1 & 2 (for Randy Rogers)

Author/Opus: This is the 146th puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: Place the digits 1-9 in some of the cells, so that no digit is repeated in any row or column. Numbers on the outside of the grid indicate the sums of adjacent digit groups in that row or column, in order. Each sum is separated by at least one unused cell.

Japanese Sums Example

Answer String: Enter the 1st row from left to right, followed by a comma, followed by the 10th row from left to right. Use a capital X for empty cells.

Time Standards (highlight to view): Grandmaster = 18:00, Master = 32:00, Expert = 1:04:00

Note: Follow this link for other less common Number Placement puzzles.

Arrow/Shape/Thermo-Sudoku

Sudoku by Prasanna Seshadri

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Theme: Diamonds (for Chris Green)

Author/Opus: This is the 150th puzzle from our contributing puzzlemaster Prasanna Seshadri.

Rules: Classic Sudoku Rules. Also, some arrow shapes are in the grid; the sum of the digits along the path of each arrow must equal the digit in the circled cell. Some thermometer shapes are in the grid; digits must be strictly increasing from the round bulb to each flat end. Finally, some diamond shapes are in the grid; the labeled diamonds below the grid must be placed in some order onto the shapes in the grid. The labeled diamonds can be rotated but cannot be reflected.

Answer String: Enter the 1st row from left to right, followed by a comma, followed by the 9th row from left to right.

Time Standards (highlight to view): Grandmaster = 5:15, Master = 10:45, Expert = 21:30

Note: Follow this link for other less common variations of Sudoku and this link for classic Sudoku. If you are new to this puzzle type, here are our easiest Sudoku to get started on.

Sum Star by Dan Adams

Sum Star by Dan Adams

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Theme: Logical

Author/Opus: This is the 1st puzzle from guest contributor Dan Adams.

Rules: Place digits into some cells and shade all remaining cells so that: each dodecagon contains the digits 1-9 exactly once; digits in cells sharing a vertex with a black triangle add up to the indicated clue number without repeats; and shaded cells cannot share an edge with another shaded cell.

Magic Summer Example by Serkan Yürekli

Answer String: Enter the digits in the marked central rows (triangle, hexagon, triangle, …). Use a capital X for shaded cells. Separate each row with a comma. The example has the key “8178XX,243”.

Time Standards (highlight to view): Grandmaster = 16:00, Master = 32:00, Expert = 1:04:00

Note: Follow this link for other less common Number Placement puzzles.

Cave by Walker Anderson

Cave by Walker Anderson

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Theme: Clue Symmetry and Logic

Author/Opus: This is the 7th puzzle from guest contributor Walker Anderson.

Rules: Standard Cave rules.

Answer String: Enter the length in cells of each of the cave segments from left to right for the marked rows, starting at the top. Separate each row’s entry with a comma.

Time Standards (highlight to view): Grandmaster = 3:45, Master = 8:45, Expert = 17:30

Note: Follow this link for other classic Caves. If you are new to this puzzle type, here are our easiest Cave Puzzles to get started on. More Cave puzzles can be found in The Art of Puzzles and in Roger Barkan’s Colossal Cave Collection.

Cave Battle by Roger Barkan

Cave Battle by Roger Barkan

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Theme: Logical

Author/Opus: This is the 6th puzzle from guest contributor Roger Barkan.

Rules: Combination of Star Battle and Cave. Place digits into two cells in every row, column, and region of the left grid (one cell in the example). Digits cannot touch, not even diagonally. The numbers in the upper-left of each region indicate the identity of the digit to be entered in that region. The digits must form a valid cave puzzle (which can be solved on the bottom grid).

Cave Battle by Roger Barkan

Answer String: Enter the length in cells of each of the cave segments from left to right for the marked rows, starting at the top. Separate each row’s entry with a comma.

Time Standards (highlight to view): Grandmaster = 9:00, Master = 15:30, Expert = 31:00

Note: Follow this link for other classic Caves. If you are new to this puzzle type, here are our easiest Cave Puzzles to get started on. More Cave puzzles can be found in The Art of Puzzles and in Roger Barkan’s Colossal Cave Collection.

Cave by Roger Barkan

Cave by Roger Barkan

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Theme: Clue Symmetry and Logic (Puzzle #63 in the Colossal Cave Collection).

Author/Opus: This is the 5th puzzle from guest contributor Roger Barkan.

Rules: Standard Cave rules.

Answer String: Enter the length in cells of each of the cave segments from left to right for the marked rows, starting at the top. Separate each row’s entry with a comma.

Time Standards (highlight to view): Grandmaster = 5:00, Master = 7:15, Expert = 14:30

Note: Follow this link for other classic Caves. If you are new to this puzzle type, here are our easiest Cave Puzzles to get started on. More Cave puzzles can be found in The Art of Puzzles and in Roger Barkan’s Colossal Cave Collection.

Tapa (Islands) by Murat Can Tonta

Tapa (Islands) by Murat Can Tonta

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Theme: Clue Symmetry and Logic

Author/Opus: This is the 58th puzzle from our contributing puzzlemaster Murat Can Tonta.

Rules: Standard Tapa rules. Also, similar to Nurikabe, each clue cell is part of an island of horizontally and vertically connected white cells. Islands are allowed to touch diagonally. Islands may contain at most one clue cell, and the area of the island must be one of the numbers in the clue (as an example, if a clue is 15, then the island containing that clue must be either 1 cell or 5 cells large).

See also this example:

Tapa (Islands) by Serkan Yürekli

Answer String: Enter the length in cells of each of the shaded segments from left to right for the marked rows, starting at the top. Separate each row’s entry from the next with a comma.

Time Standards (highlight to view): Grandmaster = 5:00, Master = 13:15, Expert = 26:30

Note: Follow this link for other Tapa variations and this link for classic Tapa. If you are new to this puzzle type, here are our easiest Tapa puzzles to get started on. More Tapa puzzles can be found in The Art of Puzzles and in Tapa and Variations, both by Serkan Yürekli.