The Hardest Version Of TETRIS (Phistomefel)

** TODAY'S PUZZLE **
Phistomefel is setting sudokus again and Simon tackles his newest puzzle: Stostone Cold, a crazy variation of Tetris! What can we say except this is everything we've come to love from one of THE most brilliant minds. Oh yeah, it's not absolutely straightforward to solve... we should probably add that.
Play the puzzle at the link below:
sudokupad.app/a21fmb469t
Rules:
Fill the cells with the digits 1 to 8 such that each digit appears exactly once in every row, column and region. A region is a collection of eight orthogonally connected cells. Determining the shape of the regions is part of the puzzle. Each region has exactly one clue which is a small number in the upper left corner of some cell in that region (not necessarily the top left cell). Shade some cells such that: a) no orthogonally neighboring cells are shaded across a region boundary; b) all shaded cells within a region are orthogonally connected; an c) the digits in all shaded cells within a region sum to the region's clue. If all of the shaded groups were to fall straight down without changing shape, they must completely fill the bottom half of the grid.
** NEW SUDOKU HUNT ON PATREON **
We're delighted to share with you a brand new sudoku hunt themed around snake egg puzzles by Glum Hippo. If you've never tried snake egg logic puzzles before, prepare for serious fun - these sudokus are outstanding! Finish by May 20 to enter the competition!
Other treats on Patreon include:
- the Sumgeons & Diagrams sudoku by sunnyjum;
- Simon's latest forays into the world of Islands Of Insight;
- Mark's video looking at the new OneUp puzzle from Rodolfo Kurchan;
- his solve of Region Geometry by Emre Kolotoğlu (3hr 36min long...!);
- and Mark's latest solve of The Times Club Monthly cryptic crossword
/ crackingthecryptic
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▶ Contents Of This Video ◀
0:00 Theme music & puzzle intro
1:35 New Competition On Patreon
2:15 Happy Birthdays
7:15 Rules
14:49 Start of Solve: Let's Get Cracking
▶ Contact Us ◀
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[@christophstahl8169]

Simon to his gardner: I want a tree in the corner Gardner: Do you want a tree in each of the corners? Simon: You can only plant trees in a maximum of two corners or they'll see eachother

[@brendanz5584]

That's tree in the spotlight

[@kpopthinker3268]

we've all got sudoku brain the Tetris-Sudolu Effect

[@mikesmith4365]

I distinctly remember a video of Simon's which got interrupted partway through because the tree in his yard snapped in half.

[@WereDictionary]

I like how Simon tends to paint Phistomefel as this mythic, exalted creature of sorts and then there is an interview with him and he's just some (very approachable) guy who happens to be good at his hobby which is making sudoku puzzles.

[@nathanmays7926]

he looks and dresses nothing like i expected 😅

[@sab7184]

i've forgotten about this channel for a bit and when i remembered the name "phistomefel" out of nowhere for a week i thought that he was this immaculate greek philosopher

[@maspleben]

Both are true 😉

[@BozoTheBear]

Holy moly! I'd never even thought to look up an interview - now that I've seen him I'm blown away - I also thought of him as some kind of omniscient superbeing!

[@andrewdipplecomedy]

I legitimately expected him to be in his 70s or 80s! Absolutely zero idea why!

[@aloe2454]

I'm sweating bullets for Sven when Simon said "what we need is a button that makes the tetris fall down". F

[@angec9908]

Every time Simon says “I haven’t got a Scooby Doo” I say “ruh roh” even tho I know he’ll get it eventually.

[@chipsounder4633]

🤣

[@virtuous-sloth]

OMG now I have to do that too...

[@RL-gl8qg]

I do that, too. Let's all mass the chat in the next livestream and do it in harmony.

[@michaelbacigalupo1134]

A Tetris is actually when you clear four lines at once, possible only with the long piece in the game. So this puzzle is solved when you create a Tetris!

[@Hannah_GBS]

I'm so happy someone left this comment after I heard Simon say he needed "four tetrises" :D

[@jakekapitz]

Despite the length, this video in particular seemed to fly by -- this puzzle just flowed so well. A lot of the longer puzzles at times can get bogged down in Simon wondering where to go next and can feel frustrating (especially when you wish that he would turn on the conflict checker for just *one* second), but this one in particular was genuinely fun to watch 👏🏻

[@inspiringsand123]

Let's Get Cracking: 14:56 Simon's time: 1h9m45s Puzzle Solved: 1:24:41 What about this video's Top Tier Simarkisms?! Phistomefel: 8x (00:26, 01:01, 04:38, 04:51, 07:15, 56:14, 1:11:49, 1:25:47) The Secret: 4x (15:47, 15:50, 16:07, 1:24:27) Three In the Corner: 2x (1:19:55, 1:23:55) ​Scooby-Doo: 2x (25:19, 33:16) Bobbins: 1x (1:15:23) Knowledge Bomb: 1x (17:59) Maverick: 1x (03:47) And how about this video's Simarkisms?! Ah: 17x (01:52, 22:50, 33:40, 33:43, 35:02, 35:04, 40:42, 41:15, 45:54, 47:19, 1:01:18, 1:01:36, 1:09:47, 1:09:47, 1:13:13, 1:16:08, 1:17:19) Hang On: 9x (20:54, 23:40, 35:04, 41:15, 59:01, 1:01:23, 1:02:52, 1:09:47, 1:18:48) In Fact: 8x (12:43, 20:13, 22:06, 22:47, 22:50, 22:50, 25:58, 52:24) Sorry: 7x (01:56, 02:38, 06:07, 49:00, 59:42, 1:15:56, 1:16:54) Weird: 7x (14:45, 14:48, 32:03, 32:14, 1:03:03, 1:12:17, 1:19:19) Beautiful: 6x (38:24, 41:39, 46:04, 47:15, 52:59, 1:25:45) Brilliant: 6x (04:20, 04:22, 04:43, 04:49, 1:24:45, 1:24:55) Cake!: 6x (02:47, 02:49, 05:37, 07:03, 07:04, 07:09) Naked Single: 4x (1:19:17, 1:21:26, 1:23:16, 1:23:43) Stuck: 4x (15:37, 15:40, 1:18:16, 1:25:25) Lovely: 4x (06:46, 1:10:31, 1:11:45, 1:12:17) Snake: 4x (01:45, 02:00, 02:05, 02:09) Nonsense: 3x (19:11, 29:20, 1:08:15) By Sudoku: 3x (1:11:19, 1:13:28, 1:19:02) What Does This Mean?: 3x (16:45, 29:52, 43:58) That's Huge: 3x (23:24, 49:52) Good Grief: 2x (06:15, 49:47) What on Earth: 2x (18:17, 18:17) The Answer is: 2x (33:10, 52:35) Fascinating: 2x (55:35, 1:25:22) Shouting: 2x (03:05, 04:07) Surely: 2x (21:00, 21:11) Obviously: 2x (1:05:49, 1:24:20) Wow: 2x (1:24:17, 1:24:38) Fabulous: 2x (02:00, 1:25:57) Pencil Mark/mark: 2x (1:13:36, 1:21:49) Goodness: 1x (06:23) Bother: 1x (1:16:35) Axiomatically: 1x (22:40) In the Spotlight: 1x (1:23:58) I Have no Clue: 1x (27:24) Incredible: 1x (1:24:59) Hypothecate: 1x (52:13) Take a Bow: 1x (1:25:51) Bizarre: 1x (1:25:22) Puzzling: 1x (01:32) Whoopsie: 1x (10:12) Progress: 1x (1:25:42) Unstuck: 1x (1:15:40) Thingy Thing: 1x (1:16:11) Triangular Number: 1x (1:02:03) Most popular number(>9), digit and colour this video: Twenty Two (35 mentions) Two (81 mentions) Green (43 mentions) Antithesis Battles: Low (5) - High (1) Even (18) - Odd (2) Shaded (41) - Unshaded (14) Lowest (2) - Highest (1) Column (64) - Row (17) FAQ: Q1: You missed something! A1: That could very well be the case! Human speech can be hard to understand for computers like me! Point out the ones that I missed and maybe I'll learn! Q2: Can you do this for another channel? A2: I've been thinking about that and wrote some code to make that possible. Let me know which channel you think would be a good fit!

[@nicesquid102]

This is so cool actually, I would never have thought to do anything like it

[@westontanton5418]

The rules on LMD now read "If all of the shaded groups were to fall straight down without changing shape (like in Tetris), they must fill the bottom half of the grid without leaving any gaps and without any of the shapes sticking out into the top half." That clarification should probably be mentioned

[@bobh6728]

It could be stated by simply changing “they” (referring to shaded groups) to “all shaded cells”. Then the rule would be: If all the shaded groups were to fall straight down without changing shape, ALL SHADED CELLS must completely fill the bottom of the grid. So it is ALL the shaded cells meaning none are left over.

[@payprplayn]

@@bobh6728 Or just replace "completely" with "exactly"

[@bones7708]

That is the one thing I don't like about CtC. They should be more carefull with keeping all relevant information in the rules, when they try to express rules in shorter form than the original rules. I was stuck in the beginning for a long time before I came to comments to realize, that I had tried to solve the puzzle without full rules. After that, it was a really nice puzzle.

[@emilywilliams3237]

Are these expanded rules in the puzzle itself, or on a page where the link to the puzzle resides? (I don't have an LMD login, so I don't know how that site is set up.) If the expanded rules are on the page but not in the puzzle itself, then I suspect that CtC, as I think is usual, used the rules from the puzzle as linked at the time it was tested or recommended or whatever means it comes to them. As one of your respondents says below, yes, they do sometimes shorten a rule wording to be more concise, but I suspect that this was not the problem here (since Simon himself seemed to need the examples to understand the meaning of that particular thing.)

[@emilywilliams3237]

@@bones7708 I almost always watch the video through the end of the rules explanations to be sure that I am not going to miss something (or make a wrong assumption). Did Simon's explanation in that part of the video not explain it clearly enough? (I am not going to attempt this puzzle at all, way beyond my ability - but I did think his explanation was clear and there were no surprises compared to my understanding as he went through the solution.)

[@shawncarter7188]

I love hearing the background noises on these videos... the birds, the planes, the wind and the traffic, it all has a simply perfect subtlety that creates a wonderful ambiance to the experience...

[@Wakaflockabach]

This solve was a "Stostone Cold Stunner"... couldn't resist.

[@Sinebeast]

No rimshot for you. Just the sound of some glass shattering.

[@MrSatNt513]

Bah Gawd!

[@angec9908]

All the talk of “grey cells” is hurting MY little grey cells 🤯

[@dinane]

To Nathan - I’m right there with you - our fire was in December and my beloved cat Ruthenium didn’t make it - and yes this channel is amazing at keeping our brains occupied with better things. Numbers and colors are so comforting. And the calm voices of kind humans makes it all the better. Thank you to Simon and Mark for what they’ve brought everyone - and especially those of us who are working through to get back to “new normal.”

[@yapayzeka3183]

Shouldn't it be stated that only the bottom half of the grid has to be filled? Have I missed a point?

[@Tahgtahv]

It should be yes, as per standard Stostone rules.

[@Unbounded7]

In honor of the GOAT tetris shattering all the records recently, brilliant

[@LuanMerlin]

I haven't started the puzzle yet but I have customized two of my colour palettes in a way that one is the pastel colour version of the other and it will allow me to solve this puzzle by using colours for both marking the different regions and marking the shaded cells with the non-pastel version of the respective colour.

[@johnnycashless4758]

simon saw the three and smoothly started singing , nice !

[@MattYDdraig]

30:40 Simply incredible. The Tetris evocation was so strong I could practically hear the music playing while solving this!

[@emilywilliams3237]

Fantastic puzzle and video - I came back to watch this even though I missed it when it was originally posted. I would never want to miss a Phistomefel puzzle (even though I rarely try them myself) because I love watching you do them, Simon. You have such a good time!

[@mahmoudabdelghany7112]

Amazing setting as always. I spent so much time at first because it wasn't clear in the webapp ruleset that no shaded cells sticking out the lower half if they were to fall down; I was only able to proceed after I checked Phistomefel puzzle on German Logic Masters to find this part of the rule stated. Thanks for featuring that brilliant puzzle.

[@dinane]

The 6s were the one step I couldn’t see myself. I get annoyed when I almost solve without Simon’s help… but then again pleased to have Simon around to help.

[@nonyobisniss7928]

Gave this about 10 minutes last night, I was questioning how to even get started. Today it took me roughly as long as Simon. Interesting puzzle indeed.

[@77kaczka77]

Brilliant! Puzzle and solving.

[@brianj959]

Another great puzzle from Phistomefel, and a consummate solve from Simon! 👏👏

[@BumperChip_]

yesss i wait everyday for these videos

[@biaberg3448]

Me too

[@donaldsnyder1543]

Sudoku 3:16 says this would kick my .....

[@simonahrendt9069]

Great puzzle, loved it!

[@przemekmajewski1]

Damn this was hard, took me good 2hrs. Amazed Simon did it so fast. Even the irregular sudoku part of it was quite tricky. Fantastic merge of rules by Phistomefel!

[@In_TheMoonlight]

How pleasant it is that you get to look out your window and see large oak trees!

[@wschmrdr]

Now that's a creative one.

[@chipsounder4633]

Tetris theme... Cra cking the cryp tic star ring si mon ant tony solving phis to me fel puzzles 😂😂😂

[@gatlygat]

The Grey Cells being Green is taking me back to 90s indie club dancefloors 😊

[@timotab]

I think the title means that in order to solve this, you have to be Stostone Cold Sober

[@Orenotter]

I'm sorry my comment is late. This Tetrisy puzzle is great! One drawback it hath. It throws of the math When columns of nine are now eight. I tried using "maths", but the only rhyme I could come up with was "baths".

[@sly1024]

Wwwwait! At 38:58 Simon says there can't be 16 CELLS in the bottom left corner. The 9+7 clues mean: need cells that add up to 16, not 16 cells. Ah ok, got it now. It's two 8 cell regions

[@titusadduxas]

3:04:17 - OMG - That was hard. I’m sure they’ll get a bit easier the more you do as there’s a fair bit of new logic there.

[@BigAsciiHappyStar]

I found an interesting deduction using negative constraint: Simon can’t play the Tetris theme song on guitar otherwise that would have replaced the usual introduction music 🤪

[@6madhatter]

A way to keep track of where each piece would end up when it "falls down" would be to use letter corner marking to saw which row A-D it would end up in.

[@Daymickey]

I had the Tetris song looping in my head the whole video 😂

[@LadyEmilyNyx]

Despite red lines being very challenging to see this was immensely fun to watch

[@jacqueeofalltrades]

Thanks for the birthday love for Colette!! She was over the moon ❤! Figured I may as well share my aircraft carrier reasonings: 1. Maverick flies awfully close to that porthole of yours, Simon. 2. The bird/nature sounds coming from your “open window” are VERY OBVIOUSLY sounds of nature KZbin videos. 3. The above sounds are meant to drown out the very obvious creaks, clangs, and bangs of a bustling aircraft carrier. 4. Mark and Simon are never together because Simon is boatbound. 5. Simon’s motion sickness. I’m betting if he were on land, his semicircular canals would be just fine… 6. Simon’s constant use of the word bobbins, which is clearly the UK equivalent of bobber in the US. Proof positive you’re on a boat. 7. Dial-up internet speeds. 8. Talking about oak trees does not mean they are actually there…and as @glum_hippo pointed out, oak trees on an aircraft carrier isn’t out of the realm of possibilities 😂.

[@Qazqi]

It took me many hours on and off over a couple days, but I got there. I ended up getting a bunch of small deductions and looking at a bunch of other things that didn't really matter, then finding the clear next intended step. I think I did end up finding the (impressively) smooth solve path, but I went on a lot of detours and I think this med that's supposed to make me less distractable is making me more distractable at this dose, so I spent a lot of the 9h timer not even looking at the puzzle lol

[@QwDragon]

Just a side note: in tetris "tetris" means delite 4 lines simultaneously. Not 1 line.

[@knigo7967]

I would just like to mention that a "Tetris" usually refers to clearing 4 lines at once and not clearing a single line! ._.

[@Sinebeast]

As a wrestling fan, Having a puzzle called Stone Cold and the given numbers not being 3 1 6 is a missed opportunity.

[@Pointlesschan]

I’m sure someone already said it, but every column must have exactly 4 shaded cells

[@glum_hippo]

I’d rather believe it’s an aircraft carrier with oak trees on it, if I’m honest

[@jacqueeofalltrades]

I concur! The newfangled way things are these days, I’m believing it’s a possibility.

[@emilywilliams3237]

Love it!

[@jinkela7295]

It seems to be better to use different colours to indicate the cells belonging to the same or different regions

[@markp7262]

1:09:18 finish. This was such a fun puzzle to do, though I couldn't keep the Tetris theme song from running through my head. 🤣🤣🤣

[@jayminester]

Let’s go!

[@Gonzalo_Garcia_]

54:32 for me. I struggled a little bit too much with this one, but still a very enjoyable solve!!

[@Ardalambdion]

Imagine having to solve these puzzles is the only way to clear rows in Tetris...

[@57thorns]

At 51:26 While the colouring in r2c4 and r3c4 is proven, is it really proven that we have a region boundary? Right, the 33 region have all of its green cells.

[@DontMockMySmock]

why on earth, Simon, when you discover that "purple" means "6" and you put a 6 in all the purple cells, do you then paint all the 6s purple instead of simply removing the redundant purple??? Drives me up the wall

[@emilywilliams3237]

Simon loves his colors. I don't see any reason to be irritated by his coloring practices, it doesn't bother me and does not obfuscate the solve (usually). I love watching him no matter what odd practices he uses.

[@chucksimmons2724]

It really messes with your mind when you are so used to 9 being in the puzzle and suddenly there is no nine.

[@chipsounder4633]

At 32:34.. there is a reason that breaks.. it is the 9 clue in column 1 and the 7 clue in column 2. If you try and make row 4 column 2 shaded. That is broken because the 9 clue needs to get out and the 7 clue takes the 4th shaded cell in the column . Edit.. that got proven wrong .. ok 😢 i was assuming the cell with the 7 clue had to be shaded, no idea why. Apologies 😟

[@emilywilliams3237]

I really sincerely thank you for editing your comment. I love reading comments and learning more about how things could be done differently than what Simon (or Mark) does, and find it very difficult to discern sometimes when a commenter mentions a mistake in their logic that either doesn't seem to be a mistake or is corrected a bit later in the video. Your Edit is so helpful to me - I won't now jump into the video again to see what in the world Simon did - I am at peace knowing that he got it right. Thank you!

[@jimmyh2137]

Wait... there is something either me or Simon misunderstood from the rules. The Shaded cells must completely fill the bottom 4 rows, but what's preventing them to "stick out" above and fill MORE than those 4 rows?

[@pavva317]

That’s true, but he never actually relies on there being “at most 4” shaded cells in a column.

[@jimmyh2137]

@@pavva317 he did a lot of times. For example the 36 region could be "taller", with more shaded cells in column 2

[@ThomasEdits]

​@@pavva317 I'm pretty sure that was the basis of like half of his deductions, but I do believe the example implies for certain that this must be the way the rules are meant to be interpreted

[@AG_247]

I had the same thoughts until I saw the example at 11:35

[@colinfun]

@@AG_247 But the example is just that, it doesn't have to prove or disprove the negative implication of the instructions. Simon does this often, assuming that the instructions say more than they actually say, that filling the bottom 4 rows does not in any way preclude shaded cells in row 1 to 4 unless it is actually stated.

[@mipsuperk]

1:21:30 Simon loves his unnecessary coloring but at the same time gives Mark a hard time for excessive pencil marks. Chromatic messiness is not a lesser sin though....

[@jkid1134]

"The hardest version of Tetris" *ahem* Somebody get this man a NES controller

[@mynameismud4412]

Has Mark ever solved a Phistomefel on the channel? The only ones I've seen have been solved by Simon.

[@emilywilliams3237]

Yes, he did one about 2 years ago. The catalogue of videos in the description field will let you search and discover which video it was.

[@LednacekZ]

did not even try it. i had no idea how to translate the tetris rules.

[@Orenotter]

Small nitpick: A tetris is four complete lines, rather than one.

[@gobsvensen]

"Completely fill the bottom half of the grid" and "completely fill the bottom half of the grid and leave no shaded cells in the top half of the grid" are two different rules. The ones given don't include a negative constraint. I wonder if the negative constraint is required to solve the puzzle or is a happy accident.

[@Tahgtahv]

Standard Stostone rules say exactly the bottom half. The rules aren't particularly clear on that point.

[@dootnoot6052]

[spoilers] took 20 minutes of bifurcation, but you can prove that the 33 cage doesn't take r3c2 without the extra assumption might be possible, but feels unintended for sure

[@emilywilliams3237]

@@Tahgtahv Yes, and Phistomefel invokes that ruleset (and its assumptions) by using that in his puzzle title, I think. Simon demonstrated that by the use of the example he showed while explaining the rules.

[@theredstoneengineer6934]

104:14 for me

[@ubk-qm4rz]

Does "All shaded cells in a region are orthogonally connected" imply that there cannot be just a single shaded cell in a region?

[@jimmyh2137]

You can. 43:22

[@leporid257]

it means, that if there's a single shaded cell in a region, it's The Only single cell in the region

[@josephle5373]

69 minutes. nice

[@Squishy3757]

I think simply stated you can only have 4 shaded cells per column. And must have 4 shaded cells per column. Although this still doesn’t account for shape preservation.

[@aithne99]

This ruleset is stronger.

[@anaayoung9142]

You like to play tetris? You like to play sudoku? Why not both?!

[@KaitlynBurnellMath]

"The hardest version of tetris" -- it's a good title, but the hardest version of Tetris these days is...Tetris itself. People are only just now (35 years after Tetris first came out) reaching the highest levels. See for instance: kzbin.info/www/bejne/oIHcl2ihfqyigaM

[@RealCadde]

1:16:05 Why haven't you looked at the 15 clue yet? If 6 and 8 are out, how do you get to 15? If all you used were 5, 4 and 3. Then that's only 12. You need to use a 7. Now you have 8 remaining. You can't do double 4, so you have to use a 5. And now you have 3 remaining in one cell... You have to use 3. In essence, there's a 3-5-7 triple in the 15 clued shaded region. This leaves 1-2-4 in the column, where R2C8 can't be 1 or 2, so that's a 4. This also leads to a 1-2 pair in row three. That gives you a 1-2-5 triple in column 5. Making R6C5 a 4. Yeah, it's a bit of sudoku at that point.

[@flsal27]

Simon, have you never heard of MIT? It's the number one scientific university in the world. MIT stands for Massachusetts Institute of Technology.

[@yadt]

I've heard of MIT. I've never heard of an MIT certificate or whatever it was.

[@jaymuse127]

Stone Cold is the name of a wrestler...Cold Stone is the name of an American ice cream parlor. Perhaps the links need to figure out clue of the title

[@lapetitecuillereetlepaindo3005]

Coloring wasn't as pretty as the thumbnail :(

[@Paolo_De_Leva]

Please do not include deductions in the Rules section‼

[@ilyrm89]

Which deduction is in the rule section?

[@AG_247]

The deduction starting at 12:30 I guess, where Simon talks about certain shapes, that aren't possible to fall. I can imagine some solvers want to figure this out by themselves.

[@colinfun]

@@AG_247 Except his deduction is wrong. There is nothing in the rules that say you can't have shaded cells that would stick out of the bottom 4 rows, Simon just got lucky again assuming the negative constraint was valid when it never was, only implied.

[@nathanmays7926]

@@colinfunThe official rules in logic masters germany say no shapes can extend into the top half. The Sven Sudokupad is not a perfect match. :P

[@AG_247]

​@@colinfunI was just answering the question, where Simon was making a deduction and emphasised his words, so it can be found more easily. I didn't talk about whether it was correct or wrong. No need to @me about that