Bravo on the 237 / 14 in the centre column! Tough spot

I'm looking forward to watching your solution. So few people do notation-free solving of these not-so-hard “Hard” puzzles. I did it as a speed run, but I didn't have to explain my reasoning to anybody. Here's my path, just for variety (36 = row 3 column 6; second write-in): 33, 36, 77, 49, 48, 37, 38, 87, 27, 57, 68, 35, 39, 95, 88, 65, 75, 82, 11, 13, 83, 93, 89, 18, 26, 86, 98, 81, 91, 84, 94, 44, 61, 66, 58, 79, 99, 78, 92, 73, 96, 76, 69, 68, 19, 29, 22, 12, 24, 46, 54, 16, 14, 41, 43, 21, 23, 51, 53. And here, as a little gift, is a grid that I created today, especially for you. It's tricky without notation, but perfectly possible: 003 000 007 020 600 003 105 090 004 040 800 000 007 000 300 000 002 060 800 010 509 700 004 080 900 000 700 003000007020600003105090004040800000007000300000002060800010509700004080900000700 HoDoKu rating: Medium 908 Andrew Stuart rating: Tough Grade 113 At least one of the two formats should paste into most apps or programs that accept user-submitted puzzles.

Omg your so good my mind almost explode 😂😂❤ Keep it up!!

That was quite remarkable, well done and thanks. This was a fiendish puzzle, no way I could have solved it, even with notes.

Great solve. Amazing that even though you missed the 1345 solve along the middle band that you looked at for a long time from 8:50 on (the 3 and 5 were not in the last cell due to hidden pointing you had shown earlier), placing the 4. You instead moved to find a different solution based on the 698 elimination in the same section. It just shows that every double or triple etc has an inverse.

It´s amazing how, from a seemingly hopeless situation, a low glow forms as you find one or two numbers, then a brighter light develops as you get stuck into the puzzle, which then burst open suddenly with a flash of light and, voila, its done! Good going again.

That was quite brilliant, you surpassed yourself. You had a few insights which require a 6th sense in addition to an extraordinary memory, which I´ll never have.

Nice solve. It's amazing how different things appear, you solved with an simpler 56 pair on the puzzle left, whereas I got a 156 triple in the bottom left corner squares from 2 pointing in lines. 2 ways to solve the same thing.

This was a strange one. With conventional markings, there is a 149 triple in block 9 - giving the 4 in R8/C8, but alternatively using your usual scanning method (much easier) there was a much easier 4 in the 3 cells R8/C7-9, which gives a 1 in R9/C7. - I did not see this until loooking at it a few times after solving with notes.

Phew....glad I wasn't the only one that resorted to notes....I found that a tough one

Well done again Cass, quite remarkable!

Great solve, in a very difficult puzzle!

nice work!

Good work again Cass, well done and thanks. I got stuck on this one, it was the 8s in box 7, which you spotted early, that opened this puzzle for me.

Well done again. I´m getting better after watching your technique, but I´ll never manage without notes.

Man, it is hard to do sudoku without pencil marks.

Brilliant! I am in awe of your mental capacity.

Boy, that was a real toughie WITH notes, and I got stuck. And you persevered without notes and got it, well done again.

Ha, this time I beat you on this time-wise! However, I did this by "cheating", I used the auto-note feature, so spotting the 138 triple in row 3 was easy, and then the puzzle unravelled. But well done again.

In future please give us a link where we can also try out the very same soduku for ourselves

That was quite brilliant, thank you. I feel I have learnt a lot from you, but sometimes, like this puzzle, I feel discouraged because you have a sixth sense which I lack.

Well done again Cass. Again, I was unable to solve this puzzle with notes, whereas you did it without notes. The puzzle broke open when you placed the 1/8 pair in the centre block. It puzzles me why you don´t have a thousand likes!

Good to see you are human and need to use notes once in a while -; But that sure was a toughie!

Hi Cass, your noticing the 128 in box 7 is what broke open this puzzle for me. I struggled to solve it WITH notes, and wonder at your ability, doing it without notes. What a memory!

Very good again, thanks.

Took me 55 mins.

I got stuck on the same spot

Wow. I think watching these will definitely help me get better. It all makes sense I just don't see the same things when I play.

Nice one! It´s amazing how often one digit can blow open the puzzle.

Sorry Cass, couldn´t follow you on this one without notes.

Well done again, I did this one though.

Guessed once.

I love Sudoku because it beautifully illustrates a difference between a human and a computer. A computer can solve a Sudoku puzzle in milliseconds, they just do it a very different way than humans. Can you keep 89 numbers in your head at once?

I struggled using notes, but you solved it without notes, much to my amazement, well done. The crucial cell was the 7 in row 2, which I didn´t spot.

Well done again. The 8 and 9 in row 6 were the key to this puzzle, and it was clever of you to spot them. I didn´t, and consequently got stuck, again!

I enjoy the videos as a sudoku beginner, but get lost too quickly😆

Well done, another remarkable solution! I´m afraid I cheat and have the auto-candidate mode on, but still struggle, whereas you work your way by sheer logic and memory. I hope to improve by observing your thought process, thanks a lot.

I got stuck with this one, but you solved it beautifully. I´m slowly understanding your thought process, for which thanks, and hope to cope as you do, albeit with notes.

Gutes Gameplay

Thanks again for a very interesting solution. However, at 12.00 why did you put a 1 in column 5, it could also be 8?

This was a real tough one and I got stuck. You solved it brilliantly and observing your thought process was fascinating, thank you. My memory is lousy so I couldn´t use your method, highly interesting though it is. Good volume, thanks.

Hi, sound is better but still very low. Also, please give some idea of why numbers go in cells, without notes and commentary it is difficult to keep up with you. Thank you.

Notes make it easier. Thanks for posting, though. A favorite pass time

I find your technique wonderful. However, as I commented yesterday, you are barely audible. Also, please give a little explanation. You deserve a lot more likes and will get them if you do as I recommend. Best wishes.

I like your method of solving, however, you are barely audible.