**Flower Sudoku****consists of five Sudoku puzzles, similar to Samurai Sudoku. However, these puzzles overlap each other more than in Samurai. The center grid is covered by the remaining sub-puzzles.**

*Flower Sudoku*

**Futoshiki***Futoshiki - also known as "Hutoshiki" or "Unequal"- is a logical math puzzle played on a square grid. The objective of Futoshiki is to enter numbers from 1 to 5 (or whatever the grid dimension is) in each column and each row.*

In addition, inequality constraints are given between some of the cells, indicating that one cell must be higher or lower than its neighbour.

**Girandala Sudoku***Girandola Sudoku is a Sudoku variant. It contains an extra group of nine marked cells. This group must also contain the numbers 1 through 9.*

*Hoshi Sudoku***It contains six large triangles. The numbers 1 to 9 must be placed into the cells of each large triangle. Every line of any length - even uncontinous - must contain every number not more than once.**

**Killer Sudoku***This Sudoku variant , also called as*

**,**

*"Killer Sudoku"***,**

*"Sums Sudoku"***or**

*"Samunamupure"***. The puzzle contains sub-regions with specified sums. No number can be repeated within a sub-region.**

*"Kikagaku Nampure"*

**Mathdoku**Mathdoku - also known as "CalcuDoku" or "Square Wisdom" - is a logical math puzzle. The objective of Mathdoku is to fill the grid with the numbers 1 to 9 (or whatever the grid dimension is) such that each row and each column contains only one instance of each number.

In addition, each outlined group of cells contains digits which achieve a specified result using the specified mathematical operation (+, -, ×, ÷). Unlike Killer Sudoku, numbers can repeat within a group of cells.

*Samurai Sudoku***"Samurai Sudoku" or "Gattai-5 Sudoku". It contains five grids, one in the center and 4 overlapping each corner of the central one. The numbers 1 to 9 must be placed correctly for all the five puzzle grids.**

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*Sudoku X*

This Sudoku variant is called **,**

*"Sudoku X"***or**

*"Diagonal Sudoku"***. In Sudoku X the main diagonals must also contain the digits 1 through 9.**

*"Kokonotsu"*

**Tripledoku**Tripledoku contains three 9×9 grids. The numbers 1 to 9 must be placed correctly for all of the three grids.

**Twodoku**Twodoku", "Sensei Sudoku" or "DoubleDoku". It contains two 9×9 grids. The numbers 1 to 9 must be placed correctly for both grids.

**Windowku**This Sudoku variant is called "Windoku", "Four-Box Sudoku" or "Hyper Sudoku". The puzzle contains four additional 3×3 regions that must contain the numbers 1 through 9.

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