# This Sudoku Has The Most Terrifying Rating!

TLDRIn this episode of 'Cracking the Cryptic,' the host dives into the challenging puzzle 'River Crossing' by Icy Fruit, a renowned name in the Sudoku community. The puzzle, highly praised for its difficulty and originality, requires the solver to divide the grid into three sections with complex interconnections, pushing the boundaries of traditional Sudoku. The host's meticulous analysis and the puzzle's intricacies make for an engaging and lengthy video, showcasing the beauty of problem-solving and the joy of conquering a difficult mental challenge.

###### Takeaways

- ๐งฉ The puzzle discussed is named 'River Crossing' by Icy Fruit and is highly regarded with a perfect sidoku rating of 5/5 for difficulty and a 100% approval rating.
- ๐ Magnus Josephson, a respected member of the sodoku community, considers the puzzle a masterpiece, highlighting its complexity and brilliance.
- ๐ The video also mentions upcoming streaming events and games, such as 'Islands of Insight' and a record-breaking 3-hour, 36-minute video on solving a soku by M Colot Glue.
- ๐ Birthday wishes are extended to several individuals, including Britney, Hannah, Juan, and Megan, showcasing a community aspect of the channel.
- ๐ซ The puzzle's rules involve traditional sudoku constraints with an additional yin-yang style segmentation, requiring the grid to be divided into three orthogonally connected sections.
- ๐ข The sections must share an edge with each other, and no 2x2 square in the grid can belong to a single section, adding a unique twist to the traditional sudoku puzzle.
- ๐ The puzzle features color-coding with each color representing a different numerical sequence that must add up to a specific total as indicated by numbered circles within the grid.
- ๐ก The video provides a detailed exploration of the puzzle, including logical deductions and strategies for tackling the complex rules and patterns.
- ๐ค The host contemplates various scenarios and possibilities, emphasizing the need for careful consideration and elimination of options to progress through the puzzle.
- ๐ The video script is a testament to the engaging and intellectual nature of the puzzle-solving community, with a focus on shared experiences and collective problem-solving.
- ๐ฎ The video concludes with an invitation for viewers to share their experiences and solutions, fostering a sense of camaraderie and intellectual challenge among participants.

###### Q & A

### What is the name of the puzzle discussed in the video?

-The puzzle discussed in the video is called 'River Crossing'.

### Who created the 'River Crossing' puzzle?

-The 'River Crossing' puzzle was created by Icy Fruit.

### What is the difficulty rating of the 'River Crossing' puzzle?

-The 'River Crossing' puzzle has a difficulty rating of five stars out of five, with a 100% approval rating from those who have managed to solve it.

### What is the significance of Magnus Josephson's comment on the puzzle?

-Magnus Josephson is a recognized genius in the Sudoku community, and his positive comment on the puzzle indicates its high quality and brilliance.

### What is the main objective of the 'River Crossing' puzzle?

-The main objective of the 'River Crossing' puzzle is to divide the grid into three orthogonally connected sections, with each pair of sections sharing an edge, and no 2x2 square in the grid belonging to a single section.

### What is the rule regarding the number of circles in the puzzle?

-A digit in a circle indicates the number of circles in its section, and all adjacent groups of digits along the line which are part of the same section must have the same sum.

### How long did it take the speaker to finish the 'River Crossing' puzzle?

-It took the speaker well over two hours to finish the 'River Crossing' puzzle.

### What other game is mentioned as being streamed by the speaker?

-The speaker mentions streaming the game 'Islands of Insight'.

### What is the longest video the speaker has done in terms of solving a puzzle?

-The longest video the speaker has done is 3 hours and 36 minutes, which was for solving a Sudoku puzzle called 'Region Geometry' by M Colot Glue.

### What is the significance of the birthdays mentioned in the video?

-The birthdays mentioned in the video are of the viewers, with their names and locations shared, and the speaker wishes them a happy birthday as part of the video's engagement with the audience.

###### Outlines

##### ๐ฅ Introduction and Puzzle Overview

The video begins with a welcome to the Monday edition of 'Cracking the Cryptic' and an acknowledgment of the video's length. The main focus is on a puzzle named 'River Crossing' by Icy Fruit, which has a high difficulty rating and approval from the Sudoku community. The host mentions a recommendation from the constructor Fistel and shares some personal insights about Icy Fruit's puzzles. The video also includes birthday wishes for viewers and a brief mention of an upcoming streaming event.

##### ๐งฉ Rules Explanation and Initial Analysis

The host delves into the rules of 'River Crossing,' highlighting the standard Sudoku rules with additional Yin Yang puzzle elements. The explanation includes the requirement to divide the grid into three sections and the prohibition of 2x2 squares belonging to a single section. The host attempts to illustrate the rules with examples, only to realize some mistakes in the process. The segment ends with a discussion about the sum lines and the implications of the puzzle's unique structure.

##### ๐ค Deduction and Strategy Development

The host continues to analyze the puzzle, focusing on the implications of having a checkerboard pattern and the maximum number of contiguous regions around the perimeter. The discussion includes the realization that three colors can appear once on the perimeter but not more, and the deduction that no more than two colors can be present on any boundary line. The host also contemplates the placement of colors in the central part of the grid and the potential for a continuous sequence of colored cells.

##### ๐ข Circle Analysis and Number Deduction

The host examines the role of circles in the puzzle, noting that each circle contains the number of circles in its region. The analysis leads to the deduction that one of the circles must have a value of two, and the host explores the implications of this for the other circles. The segment also includes a discussion about the minimum number of circles each color must have and the potential configurations of the colors within the circles.

##### ๐ Color Sequencing and Perimeter Deductions

The host focuses on the sequencing of colors along the perimeter of the grid, deducing that there must be a continuous sequence of a single color around the edge. The discussion involves the exploration of potential color sequences and the constraints they impose on the puzzle. The host also considers the possibility of a color being present on the perimeter without forming a continuous sequence, leading to further deductions about the puzzle's structure.

##### ๐ Advanced Deduction and Color Assignment

The host continues to work through the puzzle, using advanced logic to assign colors and numbers to specific cells. The segment includes the identification of a 'domino' effect, where two adjacent cells must sum to a specific number, and the implications of these pairings on the rest of the grid. The host also discusses the potential for certain cells to be isolated by the color patterns and the challenges this presents in solving the puzzle.

##### ๐ฏ Final Deductions and Puzzle Resolution

In the final stages of the puzzle, the host makes several key deductions that lead to the resolution of the puzzle. The discussion involves the identification of specific color sequences, the assignment of numbers to cells, and the satisfaction of the puzzle's unique rules. The host expresses admiration for the puzzle's design and the intellectual challenge it presents, concluding with a reflection on the solving process and an invitation for viewers to share their experiences.

###### Mindmap

###### Keywords

##### ๐กRiver Crossing

##### ๐กIcy Fruit

##### ๐กSudoku

##### ๐กPuzzle Solving

##### ๐กDifficulty Rating

##### ๐กMagnus Josephson

##### ๐กOrthogonally Connected

##### ๐กSection Sum Lines

##### ๐กYin Yang Sudoku

##### ๐กPatreon

###### Highlights

The puzzle discussed is called 'River Crossing' by Icy Fruit, which has a perfect sidoku rating with five stars out of five for difficulty and a 100% approval rating from solvers.

Magnus Josephson, a genius in the sodoku community, commented on the puzzle stating that it is a masterpiece.

The puzzle requires dividing the grid into three orthogonally connected sections, with each pair of sections sharing an edge, and no single 2x2 square belonging to a single section.

A digit in a circle indicates the number of circles in its section, and all adjacent groups of digits along the line which are part of the same section must have the same sum.

The puzzle is expected to be challenging, taking over two hours to solve as mentioned by the creator who faced it.

The streamer shares upcoming events, including streaming 'Islands of Insight' and bonus content for patrons.

Birthday wishes are extended to several viewers, highlighting the community aspect of the stream.

The streamer contemplates the rules of the puzzle, deducing that a checkerboard pattern is not possible due to the requirement of all colors connecting with each other.

The minimum number in any one colored circle is two, as a circle with a lower number would break the Sudoku rules.

The streamer explores the possibility of having four colors around the perimeter, concluding that it is not possible due to the puzzle's rules.

The streamer discusses the importance of the color blue in the puzzle, noting that it must reach the perimeter and connect with other blues in the grid.

A detailed analysis of the color distribution and the implications of the puzzle's rules on the possible configurations is provided.

The streamer hypothesizes about the potential colors of certain circles and the constraints they impose on the puzzle's solution.

The concept of 'domino' effects in the puzzle is introduced, where the sum of certain cells must add up to specific numbers.

The streamer expresses admiration for the puzzle's design and the intellectual challenge it presents, calling it 'brilliant'.

The streamer concludes the puzzle has been solved, demonstrating the satisfaction and accomplishment felt in completing such a complex task.

###### Transcripts

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