Sudoku by R. Kumaresan

Sudoku by R. Kumaresan

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Theme: Diamond

Author/Opus: This is the 2nd puzzle from guest contributor R. Kumaresan.

Rules: Standard Sudoku rules.

Difficulty: 3 stars

Time Standards (highlight to view): Grandmaster = 3:45, Master = 5:45, Expert = 11:30

Solution: To be posted by next Sunday (May 9th).

Note: Follow this link for other classic Sudoku. If you are new to this puzzle type, here are our easiest Sudoku to get started on. More classic Sudoku puzzles can be found in The Art of Sudoku, The Art of Sudoku 2 and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.

Nurikabe by wormsofcan

Nurikabe by wormsofcan

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Theme: Diamond

Author/Opus: This is the 4th puzzle from guest contributor wormsofcan.

Rules: Standard Nurikabe rules.

Difficulty: 2 stars

Time Standards (highlight to view): Grandmaster = 1:30, Master = 2:30, Expert = 5:00

Solution: PDF; a solution video is also available here.

Note: Follow this link for classic Nurikabe and this link for Nurikabe variations. If you are new to this puzzle type, here are our easiest Nurikabe puzzles to get started on. More Nurikabe puzzles can be in The Art of Puzzles, in our beginner-friendly book Logic Puzzles 101, and in the e-book Nurikabe by Ashish Kumar.

Nurikabe by David Altizio

Nurikabe by David Altizio

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Theme: East vs. West

Author/Opus: This is the 1st puzzle from guest contributor David Altizio.

Rules: Standard Nurikabe rules.

Difficulty: 2 stars

Time Standards (highlight to view): Grandmaster = 1:20, Master = 2:15, Expert = 4:30

Solution: PDF; a solution video is also available here.

Note: Follow this link for classic Nurikabe and this link for Nurikabe variations. If you are new to this puzzle type, here are our easiest Nurikabe puzzles to get started on. More Nurikabe puzzles can be in The Art of Puzzles, in our beginner-friendly book Logic Puzzles 101, and in the e-book Nurikabe by Ashish Kumar.

Kakuro by Salih Alan

Kakuro by Salih Alan

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Theme: T Up

Author/Opus: This is the 6th puzzle from guest contributor Salih Alan.

Rules: Standard Kakuro Rules.

Difficulty: 3.5 stars

Time Standards (highlight to view): Grandmaster = 4:45, Master = 8:15, Expert = 16:30

Solution: PDF; a solution video is also available here.

Note: Follow this link for classic Kakuro and this link for Kakuro variations. More Kakuro puzzles can be found in Kakuro and Variations by Serkan Yürekli and in The Art of Puzzles 2.

Pentominous (Borders) by Jonas Gleim

Pentominous by Jonas Gleim

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Theme: PENTOMINO

Author/Opus: This is the 6th puzzle from guest contributor Jonas Gleim.

Rules: Variation of Pentominous rules. Some borders between pentominoes are already drawn.

Difficulty: 3 stars

Time Standards (highlight to view): Grandmaster = 4:00, Master = 5:30, Expert = 11:00

Solution: PDF; a solution video is also available here.

Note: Follow this link for other Pentominous puzzles. If you are new to this puzzle type, here are our easiest Pentominous to get started on. More Pentominous puzzles can be found in the Plenty o’ Pentominous series by Grant Fikes and Murat Can Tonta and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.

Pentominous by Elyot Grant

Pentominous by Elyot Grant

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Theme: No Givens

Author/Opus: This is the 2nd puzzle from guest contributor Elyot Grant.

Rules: Standard Pentominous rules.

Difficulty: 3 stars

Time Standards (highlight to view): Grandmaster = 2:30, Master = 4:45, Expert = 9:30

Solution: PDF; a solution video is also available here.

Note: Follow this link for other Pentominous puzzles. If you are new to this puzzle type, here are our easiest Pentominous to get started on. More Pentominous puzzles can be found in the Plenty o’ Pentominous series by Grant Fikes and Murat Can Tonta and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.

Killer Su-do-ku by Michael Rios

Killer Su-do-ku by Michael Rios

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Theme: Plus and Minuses

Author/Opus: This is the 1st puzzle from guest contributor Michael Rios.

Rules: Standard Sudoku rules. Also, each row, column and bold region must contain two negative digits. The sum of the positive and negative digits in each cage must equal the value given in the upper-left corner of that cage. Digits (ignoring sign) cannot repeat inside a cage.

See also this example:

Killer Su-do-ku by Michael Rios

Difficulty: 5 stars

Time Standards (highlight to view): Grandmaster = 15:30, Master = 26:00, Expert = 52:00

Solution: PDF; a solution video is also available here.

Note: Follow this link for other classic Sudoku. If you are new to this puzzle type, here are our easiest Sudoku to get started on. More Sudoku puzzles can be found in The Art of Sudoku, The Art of Sudoku 2 and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.