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or solve online (using our beta test of Penpa-Edit tools; use tab to alternate between a composite mode for line/edge drawing and a letter entry mode.)

Theme: Words

Author/Opus: This is the 55th puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: Divide the grid into 20 regions each containing 5 cells. Regions with the same shape (including rotations/reflections) cannot share an edge. A region may contain at most one letter clue. Each letter is false; the correct letter which indicates the shape of that pentomino is either one higher or one lower in alphabetical order (for instance, a P clue could be an N or a T pentomino).

Answer String: Enter the letter associated with the pentomino occupying each cell in the two marked rows from left to right, separating the rows with a comma. Use CAPITAL LETTERS!

Time Standards (highlight to view): Grandmaster = 5:45, Master = 7:30, Expert = 15:00

Solution: PDF

Note: Follow this link for other puzzles involving Pentominoes.

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Theme: Big Twister

Author/Opus: This is the 4th puzzle from guest contributor Tapio Saarinen. You can find more of his puzzles on Perplexible.

Rules: Standard Nurikabe rules.

Answer String: Enter the length in cells of each of the black segments (the unnumbered, connected “ocean”) from left to right for the marked rows. Separate each row’s entry from the next with a comma.

Time Standards (highlight to view): Grandmaster = 12:00, Master = 21:00, Expert = 42:00

Solution: PDF; a solution video is available here.

Note: Follow this link for other classic Nurikabe. If you are new to this puzzle type, here are our easiest Nurikabes to get started on.

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or solve online (using our beta test of Penpa-Edit tools)

Theme: One, Two

Author/Opus: This is the 3rd puzzle from guest contributor Tapio Saarinen, including one earlier Outside Nurikabe. You can find more of his puzzles on Perplexible.

Rules: In this variation of Nurikabe, the island clues are now given outside the grid. These numbers must be placed in the first white island cell encountered in the corresponding direction. Each number represents a distinct island, with a total of 23 islands in this puzzle.

Answer String: Enter the length in cells of each of the black segments (the unnumbered, connected “ocean”) from left to right for the marked rows. Separate each row’s entry from the next with a comma.

Time Standards (highlight to view): Grandmaster = 4:15, Master = 10:00, Expert = 20:00

Solution: PDF

Note: Follow this link for classic Nurikabe puzzles on this website and this link for other variations on Nurikabe puzzles. If you are new to this puzzle type, here are our easiest Nurikabe puzzles to get started on.

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or solve online (using our beta test of Penpa-Edit tools; use tab to alternate between a composite mode for line/edge drawing and a shading mode.)

Theme: Infinity!

Author/Opus: This is the 51st puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: Divide the grid into some regions formed of edge-adjacent squares. Each cell is part of one region, and each region should contain exactly two given numbers. Each region must have an area that is strictly between those numbers (This means, for two number clues A and B with A < B, the area C fulfills A < C < B).

Answer String: Enter the number of cells in each connected group (between bold lines) in the marked rows. If a group is a multi-digit number, enter all digits of that number. For the example above, the entry is “34,121111,4111”.

Time Standards (highlight to view): Grandmaster = 8:00, Master = 15:00, Expert = 30:00

Solution: PDF

Note: Araf is a relatively new puzzle for us on GMPuzzles. Follow this link for other Araf.

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Theme: Stars and Stripes

Author/Opus: This is the 183rd puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Star Battle rules. Three stars per row, column, and region.

Answer String: Enter the column letter of the MIDDLE STAR in each row, going from top to bottom. Use capital letters only.

Time Standards (highlight to view): Grandmaster = 5:00, Master = 6:15, Expert = 12:30

Solution: PDF; a solution video is available here.

Note: Follow this link for other classic Star Battles. If you are new to this puzzle type, here are our easiest Star Battles to get started on.

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Theme: 1234

Author/Opus: This is the 5th puzzle from guest contributor Murat Can Tonta.

Rules: Standard Cross the Streams rules.

Answer String: Enter the length in cells of each of the black segments from top to bottom for the marked columns in the two grids, going in order from A to B to C to D and separating each entry with a comma.

Time Standards (highlight to view): Grandmaster = 6:15, Master = 14:00, Expert = 28:00.

Solution: PDF

Note: Follow this link for other Cross the Streams. If you are new to this puzzle type, here are our easiest Cross the Streams to get started on.

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or solve online (using our beta test of Penpa-Edit tools)

Theme: Logical

Author/Opus: This is the 119th puzzle from our contributing puzzlemaster Grant Fikes.

Rules: Double variations of Cross the Streams rules. First, both the shaded and the unshaded cells must be valid streams (single connected groups with no 2×2 areas). Second, while row clues act as usual and refer to shaded cells, the column clues refer to the distribution of white cells.

Answer String: Enter the length in cells of each of the black segments from left to right for the marked rows and from top to bottom for the marked columns in the two grids, going in order from A to B to C to D and separating each entry with a comma.

Time Standards (highlight to view): Grandmaster = 5:00, Master = 11:00, Expert = 22:00.

Solution: PDF; a solution video is available here.

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

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or solve online (using our beta test of Penpa-Edit tools)

Theme: Cage Symmetry and Logic (contributed by GMPuzzles to the Indian Puzzle Championship)

Author/Opus: This is the 181st puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Variation of TomTom rules. The letters A through J represent different digits from 0 to 9. Identify which letters stand for which digits and then solve the TomTom puzzle using the digit set {A < B < C < D < E < F} so that no digit repeats in any row or column and the value of each cage is correct using standard TomTom rules. Answer String: Enter the 3rd row from left to right followed by the 5th row from left to right. Separate all rows with a comma. Use digits (and not the letters A-F) for entry.

Time Standards (highlight to view): Grandmaster = 5:00, Master = 8:45, Expert = 17:30

Solution: PDF; a solution video is available here.

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

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or solve online (using our beta test of Penpa-Edit tools; use tab to alternate between ship placement and shading modes. In ship placement mode, right click gives sea, left click gives circle/square, left click and drag for rounded ships.)

Theme: Clue Symmetry and Logic

Author/Opus: This is the 6th puzzle from guest contributor Bram de Laat.

Rules: Standard Battleships rules. Also, the clues indicate the total number of white cells visible from that cell in the same row/column, not including the cell itself. The view of cells is blocked by ships. The following example image may help:

Answer String: For each row from top to bottom, enter the number of the first column from the left where a ship segment appears (enter both digits if a two-digit number). If the row is empty, enter 0. Enter these numbers as a single string with no separators.

Time Standards (highlight to view): Grandmaster = 8:30, Master = 13:30, Expert = 27:00

Solution: PDF

Note: Follow this link for more variations on Battleships and this link for classic Battleships. If you are new to this puzzle type, here are our easiest Battleships to get started on.

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Theme: Cage Symmetry and Logic (contributed by GMPuzzles to the Indian Puzzle Championship)

Author/Opus: This is the 115th puzzle from our contributing puzzlemaster Grant Fikes.

Rules: Standard TomTom rules, using the integers 1-8.

Answer String: Enter the 5th row from left to right followed by the 5th column from top to bottom. Separate all rows with a comma.

Time Standards (highlight to view): Grandmaster = 4:30, Master = 7:15, Expert = 14:30

Solution: PDF

Note: Follow this link for other classic TomTom. If you are new to this puzzle type, here are our easiest TomTom to get started on.