## SUDOKU

Regular – City – Samurai – The giant – Ninja – Junior – Letters – From outside – Windows – Diagonal – Zones – Not consecutive – Killer – Irregular – Greater than – Odd even – Plus or minus 1 – Digital – Sudokakuro – Mini – Multiple – 12×12 – 16×16 – Verbadoku

**REGULAR SUDOKU**

The classical version of the puzzle that conquered the world.

Fill the grid so that every row, column and 3×3 sector contains once each of the numbers 1 to 9.

An architect fond of Sudoku has planned the cities based on his favorite hobby and placed the buildings in rows and columns. One has to reconstruct the city, putting the numbers in the boxes representing the floors of each building. As in Sudoku, it is not possible to repeat in a row, in a column or in a pane the same number. In addition to internal numbers, there are also other kinds of clues that should be interpreted changing point of view. If one moves outside and looks inside, the highest buildings cover the smaller ones. The numbers on the pink sections indicate how many buildings can be seen by the observer from outside along the same row or column.

The samurai is a very popular variation of the “traditional” sudoku. Basically there are five intersected grids. Each grid has to be solved like a single sudoku (every row, column and 3×3 sector contains once each of the numbers 1 to 9), but the intersectd sections can be solved using both grids that overlap each other.

There are semplified versions of Sudokus for kids, starting from 4×4 grids, divided in 2×2 sections. One can also use other symbols than numbers!

Children can start to make these sudoku, having fun by putting in a row 4 symbols. Older kids may do the ones with the numbers. After the 4×4 grisd there are the 6×6 ones with 2×3 sections. This is a good training before doing the 9×9 grids and then even the bigger ones!

**SUDOKU FROM OUTSIDE**

The new variant realized by studiogiochi (Leo Colovini), which is becoming more and more popular among players: really a new approach to sudoku.

Fill the grid so that every row, column and 3×3 sector contains once each of the numbers 1 to 9. The numbers outside the grid have to be placed in one of the first 3 spaces in the matching row or column.

**WINDOWS SUDOKU**

A new intriguing variant that enables incredible reasonings.

Fill the grid so that every row, column, 3×3 sector and also coloured sector contains once each of the numbers 1 to 9.

**DIAGONAL SUDOKU**

The most classical variant.

Fill the grid so that every row, column, 3×3 sector and major diagonal contains once each of the numbers 1 to 9.

**NOT CONSECUTIVE ****SUDOKU **

Players will discover how many new observations are possible through this unusual variant.

Fill the grid so that every row, column and 3×3 sector contains once each of the numbers 1 to 9. The grids are so formed that consecutive numbers are NEVER one next to the other, vertically nor horizontally. For example, if there is an empty space next to a 2, you never will fill it in with a 1 or a 3 (consecutive numbers of 2).

**KILLER SUDOKU**

The most “numerical” variant: in order to solve this one you cant’t merely consider numbers as symbols. You also have to count!

Fill the grid so that every row, column and 3×3 sector contains once each of the numbers 1 to 9. The peculiarity of this variant is that the grid contains a series of “zones” with a different border and a little number on the top left: the result of the sum of the numbers contained in this zone (of course all different numbers) has to be that little number.

**IRREGULAR SUDOKU**

Another variant, among the classical ones.

Fill the grid so that every row, column and irregular sector contains once each of the numbers 1 to 9.

**PLUS OR MINUS 1 (+/-1) SUDOKU**

Fill the grid so that every row, column and 3×3 sector contains once each of the numbers 1 to 9. The double lines separate consecutive numbers and a regular line can not separate consecutive numbers.

**SUDOKU DIGITAL**

Fill the grid so that every row, column and 2×3 sector contains once each of the numbers 1 to 6. Only some “pieces” of the initial numbers are shown.

This game it’s a cross between kakuro and sudoku:

â€¢ all the **kakuro** rules are in use

â€¢ moreover the same digit can not be repeated inside the same row, column or sector

This combination of rules makes sudokakuro an incredibely unusual game; there is a great possibility of high level reasoning. It is ideal only for expert players of the other two games from which it derives.

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**MINI**

The rules are the ones of the classic sudoku, but the sizes can change.

Here below some examples of 6×6 sudoku (with the numbers 1 to 6) and 5×5 sudoku (with the 5 vowels).