### Pentopia by Bryce Herdt

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Theme: Back and Forth

Author/Opus: This is the 13th puzzle from guest contributor Bryce Herdt.

Rules: Standard Pentopia rules: Place some of the given pentominoes in the grid so that no pentominoes are in adjacent cells that share an edge or corner. Pentominoes cannot repeat in the grid; rotations and reflections of a pentomino are considered the same shape. The arrow clues indicate all the directions (up, down, left, and right) where the nearest pentominoes are located when looking from that square. (Arrow clues cannot contain pentomino shapes.) Also, see this example:

Answer String: Enter the length in cells of each of the shaded pentomino 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 = 2:45, Master = 4:00, Expert = 8:00

Solution: PDF

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PDF

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

Theme: One-Way Arrows

Author/Opus: This is the 170th puzzle from our contributing puzzlemaster Prasanna Seshadri.

Rules: Standard Pentopia rules: Place some of the given pentominoes in the grid so that no pentominoes are in adjacent cells that share an edge or corner. Pentominoes cannot repeat in the grid; rotations and reflections of a pentomino are considered the same shape. The arrow clues indicate all the directions (up, down, left, and right) where the nearest pentominoes are located when looking from that square. (Arrow clues cannot contain pentomino shapes.) Also, see this example:

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

Time Standards (highlight to view): Grandmaster = 6:00, Master = 10:45, Expert = 21:30

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

### Formed Cave by Serkan Yürekli

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or solve online (using our beta test of Penpa-Edit tools; use tab to shift between shading mode and the linex mode where left click+drag draws lines and right click marks X’s)

Theme: Clue Symmetry and Logic

Author/Opus: This is the 198th puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: Standard Cave rules; also, all groups of cells outside the Cave must be formed out of different arrangements of exactly five cells (i.e., different pentominoes). Pentomino shapes may be reflected or rotated, but they cannot repeat or touch each other. Not all pentominoes need to appear.

This example uses four cell regions (i.e., tetrominoes) within the same 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 = 6:45, Master = 11:45, Expert = 23:30

Solution: PDF

Note: Follow this link for other Cave variations and 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.

### Minesweeper (Pentomino) by Murat Can Tonta

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Theme: Clue Symmetry and Logic

Author/Opus: This is the 89th puzzle from our contributing puzzlemaster Murat Can Tonta.

Rules: Place the twelve pentominoes into the grid, rotations and reflections allowed. Pentominoes cannot cover the numbered cells, and different pentomino shapes cannot be placed in adjacent cells that share an edge or corner. Numbered cells indicate how many of the surrounding cells (including diagonally adjacent cells) contain parts of the pentominoes.

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 = 5:30, Master = 7:15, Expert = 14:30

Solution: PDF

### Yajilin (Pentominoes) by Murat Can Tonta

While not a Pentominous puzzle, we wanted to share a cool Pentominoes loop puzzle variant from Murat this week, who is a co-author with Grant Fikes of Plenty o’ Pentominous, released this week.

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Theme: Clue Symmetry and Logic

Author/Opus: This is the 86th puzzle from our contributing puzzlemaster Murat Can Tonta.

Rules: Variation of Yajilin. Place the twelve pentominoes into empty cells in the grid (rotations and reflections allowed). No two pentominoes can share an edge. The numbered arrows indicate the number of cells that are parts of pentominoes in the given direction. Then draw a single closed loop (without intersections or crossings) through all remaining white cells as in a Yajilin.

Answer String: Enter the length in cells of the horizontal loop segments from left to right in the marked rows, starting at the top. If the loop only has vertical segments in the marked row, enter 0. Separate each row’s entry with a comma.

Time Standards (highlight to view): Grandmaster = 8:00, Master = 12:30, Expert = 25:00

Solution: PDF

Note: Follow this link for other variations of Yajilin and this link for classic Yajilin. If you are new to this puzzle type, here are our easiest Yajilin to get started on. More Yajilin puzzles can be found in The Art of Puzzles 2.

### Pentomino (2 in 1) by Prasanna Seshadri

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Theme: Logical

Author/Opus: This is the 141st puzzle from our contributing puzzlemaster Prasanna Seshadri.

Rules: Place six pentominoes into each of the two top grids so that all twelve pentominoes are in one of the grids. Pentominoes can be rotated and reflected, but cannot touch each other not even diagonally. The numbers outside the grids indicate how many cells are used by pentominoes in that row/column. The shaded cells in the bottom grid must be part of a pentomino in one of the two top grids; the unshaded cells cannot be part of a pentomino in either grid.

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

Time Standards (highlight to view): Grandmaster = 3:30, Master = 6:45, Expert = 13:30

Solution: PDF

### Pentopia by Carl Worth

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Author/Opus: This is the 12th puzzle from guest contributor Carl Worth.

Rules: Standard Pentopia rules: Place some of the given pentominoes in the grid so that no pentominoes are in adjacent cells that share an edge or corner. Pentominoes cannot repeat in the grid; rotations and reflections of a pentomino are considered the same shape. The arrow clues indicate all the directions (up, down, left, and right) where the nearest pentominoes are located when looking from that square. (Arrow clues cannot contain pentomino shapes.) Also, see this example:

Answer String: Enter the length in cells of each of the shaded pentomino segments from left to right for the marked rows, starting at the top. Separate each row’s entry from the next with a comma. The example has the solution “21,23”.

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

Solution: PDF

### Pentopia (Transparent) by Prasanna Seshadri

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

Theme: Clue Symmetry and Logic (originally on 2016 Polish Puzzle Championship)

Author/Opus: This is the 119th puzzle from our contributing puzzlemaster Prasanna Seshadri.

Rules: Variation of Pentopia rules: Place some of the given pentominoes in the grid so that no pentominoes are in adjacent cells that share an edge or corner. Pentominoes cannot repeat in the grid; rotations and reflections of a pentomino are considered the same shape. The arrow clues indicate all the directions (up, down, left, and right) where the nearest pentominoes are located when looking from that square, ignoring the clue cell itself. (Pentominoes can sit on the clue cells.)

Answer String: Enter the length in cells of each of the shaded pentomino 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 = 3:15, Master = 4:00, Expert = 8:00

Solution: PDF

### Easy as Pentomino Snake by Serkan Yürekli

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or solve online (using our beta test of Penpa-Edit tools using a composite mode where left click inside cell shades square, left click + drag draws line segment, right click inside cell adds dot, and right click on cell edge adds an x.)

Theme: Clue Symmetry and Logic

Author/Opus: This is the 91st puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: Draw a snake (a 1-cell wide path) out of pentominoes that doesn’t touch itself, not even diagonally. The head and tail of the snake are given by circles. Pentominoes can be rotated/reflected, and can be used more than once. The letters outside the grid represent the first pentomino visible in the corresponding direction.

Answer String: Enter the number of cells used by each of the snake segments from left to right for the marked rows, starting at the top. Separate each row’s entry with a comma. The example has the answer “211,231”.

Time Standards (highlight to view): Grandmaster = 2:30, Master = 3:30, Expert = 7:00

Solution: PDF