Kakuro: Number Crossword - Logic-based number puzzle

Complete the vacant squares so that each section totals the number indicated on its side or above it. Each puzzle features a blank grid with sum clues placed throughout. 

The aim is to fill in all empty cells with numbers ranging from 1 to 9, ensuring that the total of each horizontal section matches the clue to its left and the total of each vertical section corresponds to the clue above it. Moreover, no digit can be used more than once within the same section.

Kakuro puzzles are highly engaging logic challenges that can be likened to numerical crosswords. By utilizing pure logic along with straightforward addition and subtraction techniques, these captivating puzzles provide endless enjoyment and mental stimulation for enthusiasts of all abilities and ages.

The game has a zoom feature for easier navigation through larger puzzles, alongside useful tools such as displaying potential sum combinations within a section, indicating the remaining sum needed for a section, and allowing pencil marks for temporary number placements in the grid.

To visualize your progress, graphic previews in the puzzle collection illustrate the advancement of all puzzles in a set while you solve them. There's also a Gallery view option that presents these previews in a bigger format.

For added enjoyment, Kakuro is ad-free and features a Weekly Bonus section which offers an extra free puzzle every week.

Puzzle Features：

• 200 complimentary Kakuro puzzles

• Additional bonus puzzle released for free each week

• Various difficulty levels from easy to extremely challenging

• Grid dimensions of up to 22x22

• Includes Samurai Kakuro with 5 grids

• Continuously updated puzzle library with new material

• Curated selection of high-quality puzzles

• Each puzzle has a unique solution

• Offers hours of mental challenges and enjoyment

• Enhances logical reasoning and cognitive abilities

Gaming Features：

• No advertisements

• Unlimited puzzle checks

• Unlimited hints available

• Error highlighting during gameplay

• Unlimited Undo and Redo options

• Pencil marks tool to assist in tackling difficult puzzles

• Autofill mode for pencil marks

• Feature to display Sum Combinations

• Feature to show Sum Remainder

• Ability to play and save multiple puzzles simultaneously

• Options for filtering, sorting, and archiving puzzles

• Dark Mode compatibility

• Graphic previews that track puzzle progress in real-time

• Zoom in, out, and reposition puzzles for optimal viewing

• Support for both portrait and landscape orientations (tablet only)

• Record puzzle completion times

• Backup and restore puzzle progress via Google Drive

Tips：

1. **Prioritize Filling in Certain Items at the Start**

First, find areas with only unique number combinations (e.g., two cells summing to 3 can only be 1+2), and fill in the numbers directly to reduce the difficulty of subsequent reasoning; use the "Remaining Sum" function to quickly calculate the total sum of values still needed to fill the area.

2. **Skillfully Use the Elimination Method to Lock in Numbers**

Eliminate numbers already filled in within the same area from repeated use. Combine this with the "Number Combination Hints" function to filter possible number combinations in the current area, gradually narrowing down the range; if an error is found, use the "Undo" function to revert to the previous state to avoid a chain reaction of errors.

3. **Make Good Use of Auxiliary Tools**

Temporarily record uncertain numbers using the "Pencil Mark" function. Enabling auto-fill mode allows for quick marking of candidate numbers; when encountering a bottleneck, use the "Hint" function to obtain clues to key locations, prioritizing solving intersecting areas (cells where horizontal and vertical clues intersect).

4. **Advanced Strategy**

Start from the grid edge or a small area (rows/columns with fewer cells) and gradually work towards the center; after completing a portion of the area, use the "Check" function to verify that the filled numbers meet the sum requirements and avoid rework later.

About Kakuro：

Kakuro puzzles are also known by other terms such as Kakkuro, Cross Sums, and Tashizan Cross. Much like Sudoku, Hashi, and Slitherlink, these puzzles are solved solely through logical reasoning. All puzzles offered in this app are created by Conceptis Ltd., a prominent provider of logic puzzles for both print and digital media worldwide. 

On average, over 20 million Conceptis puzzles are completed daily across newspapers, magazines, books, and online platforms, including smartphones and tablets globally.

Related Questions and Answers：

1. **Q**: What are the core gameplay and rules of this game?

**A**: The core is to fill in a blank grid with numbers from 1 to 9, ensuring that the sum of the numbers in each horizontal area equals the number of clues on the left, and the sum of the numbers in each vertical area equals the number of clues above. Numbers cannot be repeated in the same area. This is a logic puzzle that requires a combination of addition and logical reasoning. Each puzzle has a unique solution.

2. **Q**: What tools are provided to help with solving the puzzles?

**A**: It includes a variety of useful tools, such as a pencil marking function (which can temporarily record candidate numbers and also supports automatic filling), a display of possible number combinations in the area, and a hint of the remaining sum in the area. There are also unlimited review, hints, and undo/redo functions, as well as highlighting of incorrect answers to help players overcome difficult questions.

3. **Q**: What content and difficulty options are available in the game? 

**A**: 200 free puzzles are initially available, with one free bonus puzzle added weekly. Difficulty levels range from easy to extremely difficult, with grid sizes up to 22x22, including a 5-grid Samurai Kakuro puzzle. The puzzle library is continuously updated with high-quality content to cater to players of all skill levels.

4. **Q**: What are the game's convenient features in terms of control and experience?

**A**: Puzzles can be zoomed and moved for optimal viewing, and tablets can switch between landscape and portrait modes. There's a dark mode, a graphical preview that tracks puzzle progress in real time (including a large gallery view), the ability to play and save multiple puzzles simultaneously, and support filtering, sorting, and archiving. Solving times can be recorded, and progress can be backed up and restored via Google Drive. There are no ads.

5. **Q**: What are the benefits of playing this game? **Answer**: In addition to providing continuous mental challenges and entertainment, it can also effectively improve logical reasoning ability and cognitive level. It is suitable for players of all ages and different ability levels. Daily play can exercise mathematical calculation ability and rigorous logical thinking.