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Can you name the answers to the most difficult logic puzzle ever?
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There are 25 cells. 16 are Xs. Nine are numbers: 1,2,3,4,5,6,7,8,9. Each number appears exactly once. Find where each number and each X is. Wrong answers end quiz. This can be solved without guessing.
Two Minute Logic Puzzle
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Most Difficult Logic Puzzle Ever Quiz
Created Dec 3, 2012 in
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Dec 3rd, 2012 at 08:04 GMT
Many thought that the "Hardest Logic Puzzle Ever" was too easy. So here is a MUCH harder one.
Dec 3rd, 2012 at 09:51 GMT
Wow!! That was challenging, most thinking I've done on one of these, and that says something considering every day I search "Logic" on here to see if the number of results increased. Make more!!
Dec 3rd, 2012 at 09:54 GMT
Also I was afraid not being sure if Y is a vowel affects this quiz and I was sure I was gonna be commenting telling you to specify that, but even with the other vowels' clues Y is figured out shortly after anyway so it didn't matter.
Dec 3rd, 2012 at 10:40 GMT
Awesome puzzle. I especially liked the W clue: a short moment of 'wait, what?' quickly followed by 'ooh, I see...'.
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Dec 3rd, 2012 at 16:14 GMT
The statement in Cell N says "If Cell R is a 7, then cell W is a 9." But this is wrong because the 7 is in cell Q, not R, which has a 6.
Dec 3rd, 2012 at 16:40 GMT
@ampel Cell N's clue says "if." It's a conditional statement. IF Cell R is a 7 then Cell W is a 9. That cannot be true, so you know that Cell R isn't a 7. Cell N never says that Cell R is a 7.
Dec 3rd, 2012 at 17:00 GMT
Much harder and much better than your previous one. I loved it! Special shoutout to the if statement in cell N... I always put one of those infamous if statements in my puzzles and there are always questions/complaints, so get ready for that. 5/5
Dec 3rd, 2012 at 17:46 GMT
Much better. I still think the hardest was the first puzzle on here, though perhaps I wasn't used to it yet.
Dec 3rd, 2012 at 22:01 GMT
##POTENTIAL SPOILER## I feel like I am either missing something here, or the puzzle is invalid. Because I can think of multiple, yet equally valid solutions to the puzzle after all vowels, as well as rows 1 and 5 are cleared. I spent far too much time on this and eventually looked at the solution. There, it states in item 3--that column 1 must contain either 1,2,3 or just 1,2 since a 4 or higher would force lower numbers to the right. However, we know that there is only one number in row 4--therefore, there could be any number in row 4 without the problem of a higher number to the right of it. Based on the clues available up until this point-- I see no reason why row 4 could not have a number greater than 3 in the first column? For example 1,3,4,8 could be in row 2 and in that order; 2,5,6,7 in row 3; and a 9 could be in row 4. Similarly, row 2 could contain 5,7,8,9; row 3 could then contain 1,3,4,6; and row 4 contain a 2. There are actually about a dozen solutions like this where a number higher than 3 could be in the first column that would seem to be consistent with the clues given up to this point. Since you need to know at least one(if not more) of the numbers before moving on, and since you aren't supposed to need to guess--how do we really know that column 1 must contain either 1,2,3 or 1,2 ?
Dec 3rd, 2012 at 22:32 GMT
@Kinzzz: The "anywhere to the right" clue means "anywhere, regardless of row." Hope that clears things up!
Dec 3rd, 2012 at 23:17 GMT
@MisterF: I thought of that, but by that logic, square "C" would be to the right of square "B". And, according to the key--"B" = 3 and "C" = 2. Therefore, B > C.
Dec 3rd, 2012 at 23:19 GMT
@kinzzz Yes but B and C are in the same column so neither of them are left or right of each other.
Dec 3rd, 2012 at 23:24 GMT
Ah, thank you, MisterF. I guess I took that clue to only mean that it did not have to be to the immediate right of the square.
Dec 3rd, 2012 at 23:26 GMT
I did the exact same thing. I think it would have made more sense to explicitely include different rows in the clue.
Dec 3rd, 2012 at 23:28 GMT
@kinzzz: You said "Similarly, row 2 could contain 5,7,8,9." That doesn't add up to 22 and that would mean lower numbers would be to the left of the first column which isn't possible due to the clue in Cell Y.
Dec 3rd, 2012 at 23:44 GMT
@Buckler: Yes, but the clue from square "x" would not be uncovered by that point without guessing. Correct: I originally misunderstood Y to mean within the same row, just not necessarily immediately to the right.
Dec 4th, 2012 at 01:49 GMT
I suppose I would recommend that the Y clue be restated somehow. As it stands, you sort of have to "guess" whether it means single rows or the entire board; it can be interpreted either way.
Dec 4th, 2012 at 02:12 GMT
@antithesys: I instantly knew it meant any row. The creator put ANYWHERE in all caps. Pretty clear that it meant ANYWHERE to the right.
Dec 4th, 2012 at 09:01 GMT
For that ambiguous clue, how about something like “No number is higher than any number in a column further right”?
Dec 5th, 2012 at 15:13 GMT
That cell W clue was absolutely brilliant!
Dec 5th, 2012 at 15:31 GMT
Nice puzzle. I got stuck on the clue in cell F (made a bad assumption). Definitely put my brian to work!
Dec 5th, 2012 at 16:25 GMT
There is now a new puzzle that is possibly even tougher. I put a link in the description of this puzzle. "Toughest Logic Puzzle Ever."
Dec 5th, 2012 at 16:32 GMT
I'm not that good at these logic puzzles; there have been several that I have tried to solve, and mostly I have had to either let it go or to resort to looking at the provided solution. This one, however, was relatively easy in my opinion. I haven't been paying that much attention to these puzzles, so I don't know if the "most difficult logic puzzle ever" is meant sarcastically or not. I just think that it should be clearly stated somewhere that Y is (not) considered a vowel for the purposes of this quiz. Preferably not, since it's not needed to solve it. Great job, regardless!
Dec 6th, 2012 at 00:18 GMT
took me a while to parse the clue in W, which I'm sure was the intent. It's a clever play on words, but not sure it really fits in a "logic" puzzle.
Dec 6th, 2012 at 13:42 GMT
I'm not sure whether the clue in W was brilliant or just stupid, but it definitely was the hardest part of this quiz.
Dec 7th, 2012 at 11:55 GMT
Foxed by the clue in W - I ended up guessing wrong so got 23/25. :-(
Dec 7th, 2012 at 14:03 GMT
I love your LOGIC games, but having three games that all claim that they are the hardest toughest most difficult ever is ILLOGICAL!
Dec 7th, 2012 at 16:22 GMT
@hellofromUK: it's intended to be ironic, because it's illogical logic puzzle titles.
Dec 8th, 2012 at 03:26 GMT
Please specify in the quiz instructions exactly what qualifies as a vowel. Because (spoiler alert) 'W' is a vowel in the words 'cwm' and 'crwth'. Something like “Letters which can be used as consonants, do not count as vowels” would suffice.
Dec 9th, 2012 at 05:46 GMT
Can someone please explain this to me [thanks] : I am at the point where I have placed everything except the 1/2, 6/7 and 8/9. Basically at that point all I have to go on is the clue in cell X (row 2 sum = 22). In that row I've placed the 3 and the 4, so the remaining two cells are either 6 and 9, or 7 and 8.... and I don't see how I can deduce a "right" answer at that point (and the clue in N doesn't affect my deicion-making). THANKS.
Dec 9th, 2012 at 19:24 GMT
@Sneuticles Well, you do need Clue N. Because 3+4+6+9=22, meaning you have 7 in R. If you have 7 in R then according to N you should have 9 in W - but you don't, you have 9 in V in order to get the sum of 22.
Dec 10th, 2012 at 10:00 GMT
To be honest, I found this quiz a lot easier than most other logic puzzles on this site. Indeed clue W proved to be the bottleneck for me... I get it now though!
Dec 10th, 2012 at 17:55 GMT
I didn't even get why people weren't getting W until now. When I was up to it, I just knew it had to be about the last two numbers, and I immediately knew it meant position. Only after reading the comments did I realize how people got tripped up seeing it as a tautology.
Dec 11th, 2012 at 00:09 GMT
W is a vowel. It really is!
Dec 14th, 2012 at 20:09 GMT
I thought the clue in W was to do with Roman numerals. I was wrong.
Jan 1st, 2013 at 17:45 GMT
Loved this puzzle & all your other logic puzzles.Please make more! *You have gained 1 follower.*
Jan 4th, 2013 at 01:34 GMT
huh. Took me quite a bit, but I caught on.
Jan 8th, 2013 at 18:58 GMT
Took five attempts before I figured it out - definitely more difficult than the first. Did you come up with this all by yourself? If so you should go into puzzle book making! :D
Jan 31st, 2013 at 14:26 GMT
feel bad for z... only letter without a spot
Feb 10th, 2013 at 01:18 GMT
I appreciate the effort on the Lowest Number clue. Not the only way that can be interpreted however. For instance, I went for the box (C or D) which was the lowest Roman Numeral...
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