Ouch. After not doing sudokus for a few months, I broke the surplus 6x6 and 9x9, chain 9x9, two standard 9x9s and the standard 8x8. The solves were all good, but the toroidal was particularly amusing :) At least I quickly could tell that I didn't break it...

I could not uniquely solve Irregular Sudoku (Small example on Page 4) in IB. It seems to be having multiple solutions (at least more than 4)
Here is one of my alternative solution.
142635
623514
251463
436152
564321
315246

Please do let me know if I am making any mistakes while solving this puzzle?

Yes.

Even to solve offline, I'm not able to login.
In the discussion page, I'm shown as logged in, but when I go to the sudoku page, I cannot find either the login credentials or the password for the competition. Please help!
Rashmi

Where :)

How well did the variants represent the theme of the test ?	variations represented the theme well
What was your opinion of the distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Very nice
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount
What was your opinion of the booklet formatting and printing?	Just right

How well did the variants represent the theme of the test ?	variations represented the theme well
What was your opinion of the distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Fairly Nice
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount
What was your opinion of the booklet formatting and printing?	Just right

R1C6 and R2C4 are in the same region and you have two 5s. So there's one mistake. I just solved the puzzle fine.

I don't know what happened, but I got into "the flow" and felt like I had my best performance for years. Pure adrenaline. Wow. Thank you for this experience.

We have put a restriction on score page - it can be refreshed once in 10 minutes.

How well did the variants represent the theme of the test ?	variations represented the theme well
What was your opinion of the distribution of easy/hard puzzles?	Just right
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount

How well did the variants represent the theme of the test ?	variations represented the theme well
What was your opinion of the distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Fairly Nice
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount
What was your opinion of the booklet formatting and printing?	Just right

Thanks Prasanna, mistake was from my side, I could not proceed logically after putting some number for this Sudoku. Making a guess lead me to different solution and I did not realize that same numbers fall on same regions.

How well did the variants represent the theme of the test ?	variations represented the theme well
What was your opinion of the distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Very nice
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount

Rohan and Deb - Thanks as always for the time and effort put in to making another enjoyable set of puzzles. I found the surplus challenging, as well as the chain. My favorite was the large toroidal (I liked the BL to TR pattern).Cheers, Dave

How well did the variants represent the theme of the test ?	variations represented the theme well
What was your opinion of the distribution of easy/hard puzzles?	Too many easy puzzles
What did you think about the puzzle quality of the test?	Fairly Nice
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount
What was your opinion of the booklet formatting and printing?	Just right

I also found the 13 pointer (surplus 9x9) more time-intensive than the 17 pointer (chain 9x9).

How well did the variants represent the theme of the test ?	variations represented the theme well
What was your opinion of the distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Very nice
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount
What was your opinion of the booklet formatting and printing?	Just right

How well did the variants represent the theme of the test ?	variations represented the theme well
What was your opinion of the distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Very nice
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount
What was your opinion of the booklet formatting and printing?	Just right

How well did the variants represent the theme of the test ?	variations represented the theme well
What was your opinion of the distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Very nice
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount
What was your opinion of the booklet formatting and printing?	Just right

How well did the variants represent the theme of the test ?	variations represented the theme well
What was your opinion of the distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Very nice
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount
What was your opinion of the booklet formatting and printing?	Just right

i agree with rakesh that surplus sudoku was the tougheest . i also found the 6x6 scattered sudoku tougher than the 9x9 scattered sudoku. i goofed up the chain sudoku , else i would definitely be getting bonus points as i still had 5 minutes even after messing up the chain sudoku and submitting the rest of the answers.

How well did the variants represent the theme of the test ?	variations represented the theme well
What was your opinion of the distribution of easy/hard puzzles?	Too many hard puzzles
What did you think about the puzzle quality of the test?	Very nice
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount
What was your opinion of the booklet formatting and printing?	Just right

Another SM episode with a brilliant set of sudokus.My favourites of the lot were Scattered (10) wherein I admired the way the scattered cells were constricted within the middle 3 columns which in turn forced a lot of quick deductions and the Ir-regular(11)
My entire solve duration of 67 minutes was split into 3 sessions.The first session was consumed by the chain sudoku (3 pointer)for 7 minutes.The next session ,where to shrug off the poor start, I increased the pace without worrying about accuracy and completed the rest except the chain (17 points)without any errors by 54 mintues and the final session where after submitting the answers of the middle lot during which I took a bit of breather, I focussed intensely on the last chain assuming it to be very difficult.It was indeed difficult and consumed close to 15 minutes but had a very lovely solving path.
Just like the others,I too found the smaller pointers a bit more venomous than their worth.For instance the scattered and the surplus lower pointers were hard to solve for me.
The test itself was excellent ,taillored well to fit the 90 minute slot.I had great fun solving the puzzles.
Thanks a lot Rohan Rao aka R^3!! for a beautiful test. :-p

How well did the variants represent the theme of the test ?	variations represented the theme well
What was your opinion of the distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Very nice
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount

How well did the variants represent the theme of the test ?	variations represented the theme well
What was your opinion of the distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Very nice
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount
What was your opinion of the booklet formatting and printing?	Just right

How well did the variants represent the theme of the test ?	representation could have been better
What was your opinion of the distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Very nice
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount
What was your opinion of the booklet formatting and printing?	I have a different complaint