mentally stimulating diversions
Random Just For Fun
Just For Fun
Can you name the answers to the toughest logic puzzle ever?
Enter an answer in the box below
Correctly named answers will show up below
Click any empty or to answer for that location
: Entering some wrong answers will end the quiz
There are 25 cells. 5 are letters: A,B,C,D,E. 5 are numbers: 1,2,3,4,5. 15 are Xs. Each letter and number appears only once. Find out what's in each cell. Touching includes diagonals. No need to guess
Most Difficult Logic Puzzle Ever
This quiz has not been verified by Sporcle
Popular trivia games today
Geography Bunker IV
US Cities: West to East
State Abbr. Blitz with Booby Traps
Figure Out the Lyrics (One-Hit Wonder)
Pokémon Weaknesses with Booby Traps
Word Ladder: Chekhov's Gun
Red, Green & Blue Mind Bender
Enter answer for
/25 answers correct
Show Missed Answers
HIDE THIS WARNING
You might also like these games:
Sporcle Pyramid Minefield
The Odd/Even Challenge
for this game.
(Warning: comments may contain spoilers)
Toughest Logic Puzzle Ever Quiz
Created Dec 5, 2012 in
Just For Fun
Game Plays 13,831
Friend Scores and Standings
Loading friend results....
Top Games Today in Just For Fun
Word Ladder: Chekhov's Gun
Red, Green & Blue Mind Bender
Clickable 1-100 Mines
Missing Word: NOT a Best Pictu...
Top Games with Similar Tags
The Odd/Even Challenge
Crazy Number Logic Puzzle
A Booby-Trapped Minefield Puzz...
Logical Logic Puzzle
Top User Games in Just For Fun
Mrs. Peabody's Special Recipes...
☼☼☼ Symbol Match Minefie...
Election Logic Puzzle
Cats, Dogs, and Kangaroos! Log...
Dec 5th, 2012 at 08:46 GMT
Solution will be posted soon.
Dec 5th, 2012 at 10:08 GMT
Really enjoyed playing. Thank you!!
Dec 5th, 2012 at 11:25 GMT
You're on a roll, Buckler! Make more!
Dec 5th, 2012 at 12:51 GMT
"There's no way to continue from here." (Many minutes later) "Wait a minute.....Aaaahhhhh! So that's it." Very satisfying puzzle. An excellent one, for sure.
Dec 5th, 2012 at 16:13 GMT
Very tough. I have all 15 Xs and the number 4 placed. Of the remaining 9 boxes, I know exactly which ones are letters and which ones are numbers, and I have eliminated at least one possible letter or number from each.
Dec 5th, 2012 at 16:44 GMT
I have everything but C3, C4, D2, and E3... I know which two are letters and which two are numbers, but it seems as though there are two possible solutions at this juncture. What am I missing?
Dec 5th, 2012 at 17:36 GMT
mastertonbury - read the clue in box E4, it will guide your next move. Great quiz, Buckler! Really enjoyed this one!
Dec 5th, 2012 at 17:41 GMT
^How is the clue in E4 going to help him if he already knows which 2 boxes have numbers and which 2 have letters?
Dec 5th, 2012 at 17:59 GMT
The C1 clue is confusing me. Right now I have 13 Xs filled in, and it seems like more than 2 numbers would have to touch a letter.
Dec 5th, 2012 at 18:02 GMT
Actually, scratch that. I see what I am doing wrong.
Dec 5th, 2012 at 18:03 GMT
I'm stuck at the same point as moviegoer. I've been pondering at it for a while. I'm definitely curious what the next step is.
Also isn't the clue on E4 useless? Basically it says A1, B2, C3, D4, and E5 are not numbers... but we already have all but C3 marked as Xs and the clues on E2 and D4 rule out C3 as a number already.
Dec 5th, 2012 at 18:21 GMT
solution is now up
Dec 5th, 2012 at 18:29 GMT
I was stuck at the same part as masteronbury, E1 is the clue that you need to look at. Tough one though, had to look at the solution to finally figure it out.
Dec 5th, 2012 at 19:08 GMT
@Buckler...reading your solution and you seem to miss how much information we actually get from D4. Referring to your Step 3, knowing that 4 is in A2 does allow us to figure that the 5 in a row can't be of numbers. But because of D4 we already know much more than that.
D4 means that there has to be 1 number in every column and every row. That means there can't be a horizontal or vertical row of letters or numbers. There can't be 5 numbers in a column or row because then the numbers wouldn't be the only one in their column or row. But if a row or column has 5 letters, that would leave the 5 numbers to be placed in the 4 remaining rows or columns, also violating D4. So from D4 alone, we know that whatever the row of 5 is, it has to be diagonal. Since we already have A1, we know the diagonal has to be A5-E1. And since we already know where the 4 is, we know the diagonal has to be of letters.
Separate from that, we also know a column of 5 letters is impossible because of B2.
So, at Step 5 you say that A3-E3 is now eliminated as a possibility for 5 letters in a row because E3 is a number. But we already knew from D4 that there had to be a number SOMEWHERE on row 3. You further state that we've now narrowed it down to either a vertical or diagonal row of letters, but again, we already knew a column of letters wasn't possible both from D4 by itself and from B2.
Dec 5th, 2012 at 19:11 GMT
To continue, after I plugged in the 4 at A2, where you explain that we now know that A4 and E2 are Xs, knowing that the 5 letters were in A5-E1 in some order, and knowing that there were no other numbers in row 2 or column A, I was able to mark A3, A4, C2 and E2 as Xs.
Dec 5th, 2012 at 19:19 GMT
Ok...having read the rest of your solution, the whole problem I was having with this quiz is that the clue in E4 is not clear. I thought, like vikZ, that E4 meant that there could not be a number in A1, B2, C3, D4 or E5, because those are the only cells where "he name of the cell has a letter that is in the same postition in the alphabet as the number."
Basically, that last use of the word "number" appeared to me to refer to the number in the name of the cell, not the potential number "within" the cell itself."
Dec 5th, 2012 at 19:20 GMT
Confused about B1... should it not read shares letter not number? Don't want to cheat yet..
Dec 5th, 2012 at 19:21 GMT
So because of that lack of clarity, I could not eliminate 5 as a possibility for E3, which in turn meant that I could not eliminate 1 and 2 as possibilities for D5.
Dec 5th, 2012 at 19:43 GMT
Dec 5th, 2012 at 20:05 GMT
@moviegoer74: E4 says "No number is in a cell if the name of the cell has a letter that is in the same postition in the alphabet as the number." Note that it says "in a cell." The title of the cell isn't in the cell so for example the 1 in A1 isn't in the cell. E4's clue means that 1 can't be in a, 2 can't be in b, 3, can't be in c, 4 can't be in d, 5 can't be in e. I admit I had a tough time conveying this clue and fitting it in the small space of the cell.
Dec 5th, 2012 at 20:15 GMT
^I know now how you intended it, and it can be read that way but I don't think that's the most grammatically apt reading. It can also be read the way vikZ and I read it.
The reason is that the "in a cell" you're relying on qualifies the first use of the word "number" but it's ambiguous as to whether it qualifies the second use. To put it another way, the first part of the clue says "no number is in a cell" and the rest of the clue appears to relate only to the title. That's why I thought it meant that there was no number in A1, B2, C3, D4 and E5.
If you change the penultimate word of the clue from "the" to "that" it might clear up this confusion.
Dec 5th, 2012 at 20:50 GMT
@moviegoer74: I changed it from "the" to "that" so hopefully clears up "that" confusion. And for your other comment about the solution missing how much info D4 gives us; I just didn't want to make huge leaps so I wrote it cell by cell so it's clear for everyone.
Dec 5th, 2012 at 21:13 GMT
I got to the same place as mastertonbury--couldn't figure out if C3 or D4 was A or B. I figured if I guessed and I was right I would solve it-I knew that if C3 was A then E3 would be 1 and C3 would be 2...but couldn't figure out the E1 clue! Good challenge...I was drawing out charts on notebook paper to help me.
Dec 5th, 2012 at 21:14 GMT
And of course now I get that last step! Argh! Silly me...looking at everything except what I was supposed to!
Dec 5th, 2012 at 22:44 GMT
Took 10 tries to do it on my own. That's what makes it so fun! Thanks for the challenge!
Dec 6th, 2012 at 00:08 GMT
Clever, clever quiz. Was stuck at 21/25 for a while, then figured it out. 5 globes!
Dec 6th, 2012 at 02:50 GMT
Oh man, I completely misinterpreted clue C1. I thought it meant something like "At least one letter is touching exactly 2 numbers." In fact, I still think the clue is a bit confusing. Thank you for posting the solution; I would never have guessed that's where my error was! :)
Dec 6th, 2012 at 08:46 GMT
E1 confused me. I think it's a clever gimmick, but the issue I had was that the thing directly above it on my browser button was "give up." I feel a little bit like I got cheated out of a victory, I had the 16 with about 3 minutes to spare, it's just that my logic apparently runs out when I leave the puzzle. Also, the 5-in-a-row is kind of transparent if you've done any su doku. But, hey, great puzzle.
Dec 6th, 2012 at 11:38 GMT
Was enjoying it until the point where I had A,B,1 and 2 left. The solution to that bit wasn't so much logic, it was just annoying.
Dec 6th, 2012 at 14:42 GMT
I had a problem with clue E1 too. It's a clever trick, but some of us play on full screen, and therefore it doesn't work. I don't know whether it works for all mobile browsers too.
Dec 6th, 2012 at 14:51 GMT
The clue in E1 ruined what was otherwise an EXCELLENT quiz. I'd prefer see these kept strictly to logic. Here's a suggested alternate clue: "No number, when multiplied by the number of its cell, gives a prime number." The wording may not be optimal, but it makes the game strictly about logic.
Dec 6th, 2012 at 17:37 GMT
Yea, the clue in D4 reveals a lot. You know the 5 cons can't be numbers. Plus it can't be a vertical row, because you know it must run through C3 and you would have no place to put the C. YOu know it can't be horizontal because you have to put a number somewhere in that row. So you know after D4 that it is a diagonal of letters.
Dec 6th, 2012 at 21:47 GMT
I would have preferred the number of clues is equal to the number of X, while directing people away from instructions and comments. I got the clue right away.
Dec 7th, 2012 at 00:57 GMT
The E1 hint isn't needed to finish the quiz
Dec 7th, 2012 at 09:24 GMT
I think my brain just melted! :(
Dec 7th, 2012 at 15:56 GMT
The E1 clue is what's called lateral thinking and turns what was otherwise a "great, another one of these" into yet another winner from Buckler. As a web riddle junkie I'm ashamed for not seeing it until then.
Dec 7th, 2012 at 20:24 GMT
simply awesome, I was way too excited when I found the final clue.
Dec 8th, 2012 at 08:13 GMT
D4's clue is misleading
Dec 8th, 2012 at 21:17 GMT
Clue E1 is awesome! However, clue C1 is ambiguous: the first three times I read it, I parsed it as meaning, “There is a letter somewhere in the puzzle which touches exactly two numbers.” I’m not sure how to rephrase it to avoid the ambiguity though. Perhaps, “Exactly two numbers are touching at least one letter each.”?
Dec 9th, 2012 at 00:26 GMT
I don't get the E1 clue... somebody help me out? (I finished the puzzle, I'm just curious what it means!)
Like us on Facebook
Follow us on Twitter
Follow us on Google+
2007-13 © Sporcle, Inc.
Partner of USA TODAY Sports Digital Properties
Go to the Sporcle.com Mobile Site →