### Birthday Surprise Sudoku by Prasanna Seshadri

(Note: This bonus puzzle is being posted today to mark the occasion of Prasanna’s birthday.)

PDF

or solve online (using our beta test of Penpa-Edit tools)

Theme: 28 from 03/02 1991-2019

Author/Opus: This is the 173rd puzzle from our contributing puzzlemaster Prasanna Seshadri.

Rules: Standard Sudoku rules. The numbers outside the grid indicate the sum of all digits between the 8 and the 9 in that row or column. Also, as in Consecutive Pairs Sudoku, if a gray circle is given between two adjacent cells, then the two numbers in those cells must be consecutive. (Note: not all gray circles are given; adjacent cells without a circle may contain either consecutive numbers or nonconsecutive numbers.)

Answer String: Enter the 1st row from left to right, followed by a comma, followed by the 7th row from left to right.

Time Standards (highlight to view): Grandmaster = 6:45, Master = 10:00, Expert = 20:00

Solution: PDF

Note: Follow this link for other variations of Sudoku and this link for classic Sudoku. If you are new to this puzzle type, here are our easiest Sudoku to get started on.

• Freddie Hand says:

Great puzzle, amazing construction! Thank you!

• LorenR says:

Happy Birthday Prasanna! Thank you for the extra, special puzzle.

• Anu G says:

Loved solving this surprise. Thanx.
Happy Birthday.

• Priyam Bhushan says:

What a fun puzzle! Loved it 😉
Happy 28th birthday, Prasanna!

• skynet says:

8:39.Tremendous sudoku 😉 with an enjoyable solve path.

• Deanna says:

I stared at this for quite a while wondering WTF to do past what I saw as the first few obvious steps, then took a few educated guesses and was surprised at how straightforward it was after that (might be a spoiler but it really sryg yvxr n fgne onggyr!) Happy birthday!

• Pranav says:

7.53 on it
Very very enjoyable Prasanna..Fantastic idea well executed
And Once again,Happy Birthday 🙂

• Ramesh Swarnakar says:

Superb and Interesting…Enjoyed solving it

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