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Irregular Sumdoku 9x9 3 - what's the puzzle? Mathematical Sumoku online is created by the authors of the site as a sudoku variant of the same size: and consists of traditional 9x9 squares. However, despite the differences, it retains the basic rules that define them: you must

Irregular Sumdoku 9x9 2 solve online Welcome to this gorgeous new selection of 100+ sudoku sum puzzles in our section, selected for your enjoyment! The rules of the sudoku killer are very simple and are described below: Place each number 1 to 9 exactly once in each row, column

Paint by Numbers «Scream» consists of the grid 32x32, which can be of any width or height. The goal is to fill in the number of squares indicated on each row and column to recreate the image. In response, you will see that one of the characters in the movie "Scream" is depicted.

Puzzles or logics games are a board game whose purpose is to correctly understand how to form a union of parts of a certain image that are in different pieces or flat pieces. The first puzzle was created almost by accident by John Spilsbury in 1760, a card design expert. He did this by placing one

Japanese mosaic «Pineapple» (“Fill-a-Pix”, “Mosaic”, “Puzzle Nurie”, “Puzzle Nampre”) is a logical puzzle whose grid contains a design encoded by numbers. Each number in the cell indicates the number of cells adjacent to it (including the cell containing the number) that need to be blackened.

Corral 9x9 #1 Hard another name puzzle is Baggu, Cave. The puzzle is a rectangular grid of dots. Some of the cells formed by dots have numbers inside.

This unique numerical puzzle game Hidoku 10x10 #1 Hard, in which numbered tiles must be placed on the playing field to continue the sequence of numbers. Hidoku (Hidato, King's Hat) - one of the most difficult puzzles on the site

The Sudoku X 16x16 #1 Very Hard (diagonal sudoku or xSudoku or Sudoku X adds), compared to the classic sudoku, the further element of the two diagonals, from the upper vertex to the lower vertex of the scheme, in which the numbers, from 1 to 9, cannot be repeated.

Solution Color Nonogram «Cathedral» free online. Color Griddlers are solved on the same principle as black and white. The difference is as follows: between multi-colored groups of cells, separating (empty) cells may be absent. Color Nonogram (Japanese colored crosswords, Picross, Griddlers, hanjie,

Nonogram «Paris» - other names are Picross, Paint By Numbers, Griddler, CrossPix. In this puzzle, you need to restore the picture by the numbers that are to the left of the lines and above the columns.

Slither Link 10x10 #2 Very Difficult to solve online puzzles play Loopy for free. We are talking about the formation of a closed figure with one stroke, connecting neighboring points with vertical and horizontal lines. Each number indicates how many lines surround it, and empty fields can be

In Hitori 9x9 #1 Light is played on a square grid. At the beginning, all cells contain numbers. The goal is to paint several cells so that there are no duplicate numbers in any row or column, as in the enabled state of Sudoku puzzles (except that black squares are added to the grid).

Ripple Effect 8x8 #1 Hard - Hakyuu ("Hakyuu", "Hakyuu Kouka", "Hakyukoka", "Seismic") is a kind of logic puzzle. The field consists of a rectangular grid divided into sections (rooms); some fields may contain numbers. The goal of the game is to fill all the fields with numbers so that in each room

Kakurasu 5x5 #1 Easy another name - Bokkusu. The task is to place black and white cells in the grid. The numbers to the left and top of the grid of kakuras are the sum of the "weights" of the black cells in the rows and columns. The numbers to the right and bottom of the grid are the "weight" of

Puzzles Eulero 3x3 #2 Hard play free online. Other names - Greco-Latin square, Eulero square, Eulero. This puzzle, in fact, is two Latin squares “nested” into each other, and is named for the famous mathematician Leonard Euler. The task is to enter numbers and letters in the puzzle cells according

Dominos 8x7 #1 Very Difficult solve the Dominos puzzle online for free. The domino shapes shown were arranged to form a rectangle. After that, the boundaries between the parts were removed. Recover the missing lines so that each domino figure exists exactly once on the diagram 8x7.

Abcdoku 5x5 #2 Light solve online logic puzzle Easy As ABC for free. Other names are First Counter, Easy As ABC, Last Man Standing, ABC End View. Complete the puzzle with letters from the specified range so that in each row and column each letter occurs only once.

Neighbours 9x9 #2 Very Hard (another name is Neighbours, Nachbarn) play free online. In this variant of the puzzle there are additional conditions. In adjacent cells, separated by a bold line, there are consecutive numbers. Numbers between which there is no line cannot be consistent.

Puzzle Kuromasu 7x7 #2 Medium: This version of the number crosswords is a bit like a mixture of puzzles Pentopia and Kurodoku. Put in a 7x7 grid several different details of two colors in white or black. Rotations and reflections are considered the same figure. Pieces cannot touch each other, only

Rules and decisions of Sudoku Windoku 9x9 #8 Light solve play free online. An intriguing new option that allows surprising reasoning. Fill in all the fields so that each row, each column, each sector 3×3 and each sector of a different color contain all numbers from 1 to 9 without repeating.

Rules and decisions of Frame Sudoku 9x9 #8 The passionate architect Sudoku planned the cities based on his favorite pastime and arranged the buildings in rows and columns. This is a matter of restructuring cities, inserting numbers in the fields that indicate the floors of each building.

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Logical online encyclopedia

About this site

The site is dedicated to various crosswords, and began its work in 2011. Initially, a small list of sections, over time, is enriched with new content and ideas, and so has grown to its current size. The visitor will find some information in the field of solving different puzzles, some rules, history and crossword puzzles. Registration on the site is free and without spam.

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All content and educational resources published on can be used for personal use and fair use in schools during class. Copying, modification, public performance and any use of such content for commercial purposes is prohibited.

This section of my webpage focuses on grid-based puzzle information. To qualify, these puzzles must be self-contained and language-independent. The main thing you need to solve them is logic.
The most famous of them, of course, is Sudoku. Sudoku's predecessor was a riddle called Number Place, apparently developed by Howard Garnes and first appeared in Dell puzzle magazines in 1979. While most Dell puzzles require information provided off-grid, and many rely on cultural knowledge or specific languages, Number Place only requires the grid itself.

Japanese puzzle printing company Nikoli imported the puzzle into Japan in 1984 and continued with some key changes. First, the number of dates was set to no more than 32; Second, the puzzles were supposed to be symmetrical. These changes allowed Sudoku creators to explore more creative directions.

When Sudoku exploded in popularity, variations began to accumulate. Now there is a dizzying amount of options, some of which are given as examples in the museum. In addition to Sudoku, there are many other grid-based puzzles, many of which predict Sudoku.


In order to qualify for this site, the puzzle must be almost completely self-contained. In several cases, such as Armadillos and Star Battle, there are several clues that are outside the grid itself; However, puzzles, such as the number of crosswords that are language-independent but rely on a long list of off-grid hints, are not included.
Puzzles must also be language independent. Many have a mathematical component, and some (such as tents and a labyrinth with a horror mirror) have a cultural component. However, these components take only a few minutes to learn, and thus do not present a significant obstacle to solvers who were not previously exposed to them.

Finally, puzzles can be solved with paper and pencil. There are several independent puzzles that require moving tiles or other controls that are well suited for execution on a computer, but do not work on paper.

The puzzles on this site are not an exhaustive list. Currently, there are dozens of prolific puzzle makers, and even a complete compilation of each puzzle created by these people will be uncontrollably long; Many of their puzzles are variations of options or are created for one publication. I tried to include the basic types of puzzles, as well as qualifying puzzles from the main list, the Japanese puzzle set and Nicole. However, even these lists continue to grow.

Categories are for grouping similar puzzles, but many puzzles have different categories. The main index contains the most common name for each puzzle (as far as I know), while the full index also lists the names of options; For example, only Slitherlink appears in the base index, while Fences, Loopy, and many others appear in the full index.

In some cases, I have provided sample puzzles. Puzzle examples are my own creations based on the rules provided.
I hope you were satisfied with your visit!
Join us if you are a true crossword puzzler!
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