PUZZLE NO. 18 : RENBAN SUDOKU

RULES : Classic sudoku rules apply. Additionally , marked lines contain consecutive digits in any order.                  

PUZZLE NO. 17 : KILLER SUDOKU

RULES : Classic sudoku rules apply. Additionally, the number on the top left corner of each cage is equal to the sum of the numbers in the cage. Numbers do not repeat inside a cage.

PUZZLE NO. 16 : EXTRA REGIONS SUDOKU

RULES : Classic sudoku rules apply. Additionally , each group of nine coloured cells must also contain the digits 1 to 9.                                           

PUZZLE NO. 15 : CLONE TWINS SUDOKU

RULES OF CLONE TWINS

RULES : There are two grids. Classic sudoku rules apply on both . Moreover , both the grids are twins , i.e, they have identical numbers throughout . Some cells are shaded in both the grids. One grid is clone sudoku , i.e. digits in each corresponding cell in both shaded figures are identical . The other grid is consecutive clone sudoku , i.e. digits in each corresponding cells in both shaded figures are consecutive. You have to determine which grid is clone and which is consecutive clone and solve both the grids.

PUZZLE NO. 14 : KILLER SUDOKU

RULES : Classic sudoku rules apply. There are some cages in the grid. The number on the top left corner of each cage is equal to the sum of the numbers in that cage. Numbers do not repeat inside a cage.

PUZZLE NO. 13 : RHOMBUS SUDOKU

This variant appeared in the World Sudoku Championship this year. I had created this as practice material .

RULES OF RHOMBUS SUDOKU

Apply classic sudoku rules . Additionally , the sum of digits on the vertices of each rhombus is a multiple of the digit at the centre of the rhombus.

PUZZLE NO. 12 : CLONE SUDOKU

   

             RULES : Classic sudoku rules apply. Additionally , digits in each corresponding cell in both shaded figures are identical.( Special thanks to Pranav Kamesh for testing this sudoku and giving his feedback ).