A challenging logic puzzle: find the black fields, solve the puzzle!

Kuromasu is a challenging logic puzzle. The goal is to find the black fields on a grid with numbers, where a number indicates how many white fields this number can "see" in horizontal and vertical directions, while black fields block the view. Be careful though, black fields cannot be next to each other, and all white fields must remain connected to each other! Each puzzle has only one solution, which can be reached through logical reasoning, no guessing needed!

Solving these logic puzzles can be pretty difficult, but while playing, you can always check if your solution is correct so far, and if you are stuck, you can always ask for a hint.

Solve these logic puzzles to challenge yourself, relax, train your brain, or kill some time. This puzzle provides hours of challenging entertainment! With puzzles ranging from easy to fiendish, it offers something for both beginners and experts.

Are you up for the challenge? Can you solve them all?

Features:

- Check if your solution so far is correct

- Ask for a hint (unlimited, with explanation)

- Works offline

- Dark mode and multiple color themes

- And much more..

About the puzzle

Kuromasu can be classified as a binary determination puzzle, like Hitori or Nurikabe, or as object placement puzzle like Battleships or Star Battle (Two not Touch). The puzzle is invented by the Japanese puzzle publishing company Nikoli and it first appeared in 1991. The word kuromasu is Japanese and translates to something like "where are the black fields". All puzzles in this app are created by brennerd.

What's New in the Latest Version 3.7.1

Last updated on Jun 20, 2024

Minor bug fixes and improvements. Install or update to the newest version to check it out!

Kuromasu is a logic-based puzzle game where the goal is to fill a grid with black and white cells based on the given clues. The grid consists of squares, each of which can be either black or white. The clues are numbers placed in some of the squares, which indicate the total number of black cells in that row or column.

To solve a Kuromasu puzzle, you must use logical reasoning to determine which cells should be black and which should be white. The following rules apply:

* Each row and column must contain exactly the number of black cells indicated by the clues.

* No two adjacent cells can be the same color (i.e., there cannot be two consecutive black cells or two consecutive white cells).

* Black cells cannot form 2x2 or larger blocks.

Solving Techniques

There are several techniques that can be used to solve Kuromasu puzzles:

* Scanning: Look for rows or columns where there is only one possible place for a black cell.

* Cross-hatching: If a cell is adjacent to two or more black cells, then it must be white.

* Exclusion: If a cell is adjacent to a cell that must be black, then it must be white.

* Logical Reasoning: Use the clues to deduce the placement of black cells in other parts of the grid.

Example

Consider the following 4x4 Kuromasu puzzle:

```

1 2 1

1 1 2

1 2 1

2 1 1

```

Using the scanning technique, we can see that the first row has only one possible place for a black cell, which is the second square. Similarly, the second and fourth rows have only one possible place for a black cell, which are the second and first squares, respectively.

Using the cross-hatching technique, we can see that the third square in the second row must be white because it is adjacent to two black cells.

Using the exclusion technique, we can see that the first square in the second row must be white because it is adjacent to the black cell in the second square.

By applying these techniques, we can solve the puzzle as follows:

```

1 2 1

1 1 2

1 2 1

2 1 1

```

A challenging logic puzzle: find the black fields, solve the puzzle!

Kuromasu is a challenging logic puzzle. The goal is to find the black fields on a grid with numbers, where a number indicates how many white fields this number can "see" in horizontal and vertical directions, while black fields block the view. Be careful though, black fields cannot be next to each other, and all white fields must remain connected to each other! Each puzzle has only one solution, which can be reached through logical reasoning, no guessing needed!

Solving these logic puzzles can be pretty difficult, but while playing, you can always check if your solution is correct so far, and if you are stuck, you can always ask for a hint.

Solve these logic puzzles to challenge yourself, relax, train your brain, or kill some time. This puzzle provides hours of challenging entertainment! With puzzles ranging from easy to fiendish, it offers something for both beginners and experts.

Are you up for the challenge? Can you solve them all?

Features:

- Check if your solution so far is correct

- Ask for a hint (unlimited, with explanation)

- Works offline

- Dark mode and multiple color themes

- And much more..

About the puzzle

Kuromasu can be classified as a binary determination puzzle, like Hitori or Nurikabe, or as object placement puzzle like Battleships or Star Battle (Two not Touch). The puzzle is invented by the Japanese puzzle publishing company Nikoli and it first appeared in 1991. The word kuromasu is Japanese and translates to something like "where are the black fields". All puzzles in this app are created by brennerd.

What's New in the Latest Version 3.7.1

Last updated on Jun 20, 2024

Minor bug fixes and improvements. Install or update to the newest version to check it out!

Kuromasu is a logic-based puzzle game where the goal is to fill a grid with black and white cells based on the given clues. The grid consists of squares, each of which can be either black or white. The clues are numbers placed in some of the squares, which indicate the total number of black cells in that row or column.

To solve a Kuromasu puzzle, you must use logical reasoning to determine which cells should be black and which should be white. The following rules apply:

* Each row and column must contain exactly the number of black cells indicated by the clues.

* No two adjacent cells can be the same color (i.e., there cannot be two consecutive black cells or two consecutive white cells).

* Black cells cannot form 2x2 or larger blocks.

Solving Techniques

There are several techniques that can be used to solve Kuromasu puzzles:

* Scanning: Look for rows or columns where there is only one possible place for a black cell.

* Cross-hatching: If a cell is adjacent to two or more black cells, then it must be white.

* Exclusion: If a cell is adjacent to a cell that must be black, then it must be white.

* Logical Reasoning: Use the clues to deduce the placement of black cells in other parts of the grid.

Example

Consider the following 4x4 Kuromasu puzzle:

```

1 2 1

1 1 2

1 2 1

2 1 1

```

Using the scanning technique, we can see that the first row has only one possible place for a black cell, which is the second square. Similarly, the second and fourth rows have only one possible place for a black cell, which are the second and first squares, respectively.

Using the cross-hatching technique, we can see that the third square in the second row must be white because it is adjacent to two black cells.

Using the exclusion technique, we can see that the first square in the second row must be white because it is adjacent to the black cell in the second square.

By applying these techniques, we can solve the puzzle as follows:

```

1 2 1

1 1 2

1 2 1

2 1 1

```