Sudoku 31:Extra Region Sudoku

Rules: Classic Sudoku rules apply. Additionally, each group of 9 shaded cells will also have digits from 1 to 9.

Link:

Sudoku 30: Classic Sudoku

Rules: Place a digit from 1-9 in each empty cell so that each digit appears exactly once in each row, column and 3x3 outlined box.

Links:
Easier Version

Sudoku 29: Palindrome Sudoku

Firstly, there were issues in the image quality for some of the recent posts. Apologies for the problem. I've changed the tools I use to create the images. I hope there won't be any such issues now.

Today I'm posting a Palindrome Sudoku:

Rules: Classic sudoku rules apply. Additionally, the digits in the cells with lines form palindromes, i.e. they read the same from both the directions. 

Link:

Sudoku 28: Quadruple Sudoku

Rules: Classic sudoku rules apply. Additionally, each digit at the intersection of four cells must be present in one of those four cells.

Link:

Sudoku 27: Killer Sudoku

It has been one year of blogging. In this one year I posted 26 sudokus and was able to deliver what I had promised--a sudoku on the 1st and 15th of every month. I would like to thank all those who helped me in achieving this. Thanks to Pranav Kamesh, Akash Doulani, Gaurav Kumar Jain, Rakesh Rai, Aditi Seshadri and Falak Pahwa for testing the sudokus. Thanks to Swaroop Guggilam and Rajesh Kumar for helping me with eps files and improving the blog. Lastly, thanks to everyone for solving the sudokus, for giving your valuable feedbacks and helping me to improve the blog round the year.

Today I'm posting the sudoku, the creation of which gave me confidence that I can create good sudokus. It was created long back and many in LMI have also solved it. But I would like it to be there on the blog and any one who hasn't solved it earlier to solve; those who have solved earlier may solve once again ;) 

Rules: Classic Sudoku rules apply. Additionally, the sum of digits in cells inside every cage must equal the total given for the cage at the upper left cell. Digits do not repeat inside a cage.

Link:

Sudoku 26: Wildcard Sudoku

It has been almost a year of blogging and I have not posted any Wildcard Sudoku! Doesn't sound good ;) So, today I'm posting a Wildcard Sudoku with the theme 'W'. Hope you all like it.

Rules: Classic sudoku rules apply. Additionally, one digit acts as a wildcard. Cells with '>' symbol contain digits greater than the wildcard. Cells with '<' symbol contain digits lesser than the wildcard. It is a part of solving to determine the wildcard.

Links:

Easier Version

Sudoku 25: Even Sudoku

Rules: Classic sudoku rules apply. Additionally, cells marked with squares must have even numbers.

Link: