PUZZLE NO. 27 : THERMO SUDOKU

RULES : Classic Sudoku rules apply . Additionally , some thermometer shapes are in the grid ; digits must be strictly increasing from the round bulb to the flat end .

PUZZLE NO. 26 : ARROW SUDOKU

RULES : Classic Sudoku rules apply . Some arrow shapes are there in the grid. The sum of the digits along the path of each arrow must equal the digit in the circled cell. Digits may repeat along an arrow .

PUZZLE NO. 25 : CONSECUTIVE SUDOKU

RULES : Classic Sudoku rules apply. Additionally , adjacent cells having consecutive numbers are marked with a bar. If a bar is not present , then the adjacent numbers cannot be consecutive.

PUZZLE NO. 24 : PALINDROME SUDOKU

RULES : Classic Sudoku rules apply . Additionally , digits along the given lines read the same from either direction on the line.