65 Responses

1. sabrina says:

   September 21, 2006 at 6:33

   D
2. Erik says:

   September 21, 2006 at 9:20

   Must be D, but I can’t see why C doesn’t work also.
3. Victoria says:

   September 21, 2006 at 4:20

   Answer: D
4. tester says:

   September 25, 2006 at 1:28

   hmmm… sory, but C and D are equal…
5. Alvaro says:

   September 25, 2006 at 7:43

   Answer: both C and D are cor­rect. Great work!
6. Senia says:

   September 25, 2006 at 3:11

   I like this one! Can you give us more of these?!
   Thanks.
7. Alvaro says:

   September 25, 2006 at 10:32

   OK, will get more!
8. » Brain Teasers and Games for adults, with a neuroscience angle: our Top 50    « Brain Fitness Revolution at SharpBrains      says:

   October 16, 2007 at 11:18

   […] 25. Can you men­tally build this box?. […]
9. Scott says:

   October 27, 2007 at 8:24

   I was con­fused between C & D at first but then noticed the side with the tri­an­gle does not meet the rest of the box on the right axis.
10. Jazz says:

    November 6, 2007 at 10:32

    d
11. shounak says:

    November 8, 2007 at 9:14

    reply is A
12. shounak says:

    November 8, 2007 at 9:16

    d is correct
13. sebas says:

    November 13, 2007 at 4:12

    it is a,c,and d
14. g says:

    November 28, 2007 at 6:17

    Both C & D… only C & D.. Scott, there is no dif­fer­ence with the tri­an­gle… down­load the image and rotate it, or bet­ter yet, cut them out of paper. C & D both work. A&B Fail how­ever because the dou­ble lines do not run towards the cir­cle when folded.
15. JOse says:

    December 14, 2007 at 7:58

    en real­i­dad la unica que no encaja es la A… al rotar y colo­car la B-C-D el resul­tado es la ima­gen en cuestion.
16. craig says:

    December 15, 2007 at 12:01

    the ans is d
17. John says:

    December 19, 2007 at 2:42

    Alvaro, I don’t know if my browser if warp­ing the image, but unless what I’m see­ing has been stretched ver­ti­cally from the image you’re work­ing from, the answer can only be D. Is this sup­posed to be a cube?
18. Alvaro says:

    December 21, 2007 at 5:26

    Hello John, yes, this is sup­posed to be a cube. Doesn’t C work for you, as well as D?
19. me says:

    January 3, 2008 at 9:47

    c and d
20. Mitch says:

    January 4, 2008 at 5:12

    C & D are both cor­rect, i spent like 10minutes try­ing to work out how 1 of them was wrong. But no they are both cor­rect, and the ONLY cor­rect answers.
21. Mark says:

    January 6, 2008 at 8:17

    D
22. miss says:

    January 11, 2008 at 11:38

    i got c
23. manash says:

    January 12, 2008 at 7:57

    BOTH ‘D’ AND ‘C’ARE CORRECT
24. ***mOny*** says:

    January 25, 2008 at 7:52

    Oh!!! Hi !!!

    I think the answer is the let­ter D.

    Bye
    See you !!!
    
25. mackkk says:

    February 22, 2008 at 5:09

    D and… only D — C seems same but one never makes a cube out of C ..try
26. mackkk says:

    February 22, 2008 at 5:11

    why? well because in fact it’s not a cube but a cuboid
27. Linda says:

    February 22, 2008 at 6:31

    C & D
28. Linda says:

    February 22, 2008 at 6:32

    Thanks, mackkk. It is only D.
29. Aaron says:

    March 23, 2008 at 10:31

    It’s D, not too hard
30. Anna says:

    April 11, 2008 at 6:40

    it’s D, this one wasn’t hard
31. Mukesh says:

    June 5, 2008 at 4:03

    it is C only the cor­rect one
32. Travis says:

    June 8, 2008 at 8:23

    I don’t see how “C” is cor­rect, and lack­ing Pho­to­shop and a printer, I don’t have any way of ver­i­fy­ing this. Can some­one explain the folds required to make the block?
33. Abel.... IQ of 135 says:

    June 21, 2008 at 5:48

    i only see D really clearly.. but i haven’t tried to vizual­ize C… C has a 60% chance of being cor­rect as well.. from my view. D has a 100 % chance. — ABel was here.
34. Cal says:

    July 3, 2008 at 7:02

    C and D are cor­rect.
    You have to rotate C in three dimen­sions for it to fit but it does
35. Theofanis says:

    July 4, 2008 at 4:21

    It’d (D) because when you build the box to be exactly like the orig­i­nal you ‘ll turn it 180 degrees and then, above the cir­cle you will see the white hedra and not the black n white that is near the two lines
36. anthonette says:

    August 5, 2008 at 8:55

    C and D
    =)
37. Ishan says:

    August 9, 2008 at 7:28

    C & D
38. Ryan says:

    August 13, 2008 at 6:30

    D only if you’re not sup­posed to flip it, both C and D if you’re allowed to flip it.
39. Tarrence says:

    September 7, 2008 at 1:31

    D. C doesnt worklk because the tri­an­gle would be on the side, not the top.…
40. Behrooz says:

    September 14, 2008 at 10:29

    It’s D. Can’t be C, just look at the par­al­lel lines. They aren’t 90^ to the circle.
41. Kaitlin says:

    October 8, 2008 at 1:43

    The answer is D
    C can­not work because of the way it was cut out. if you were to try to build the box with the way C is cut, you would not get a cube.
42. emina says:

    November 3, 2008 at 12:42

    I’m pretty sure that C and D are both applicable.☺
43. Craig says:

    November 3, 2008 at 11:39

    all of the shapes there can be folded into cubes… it is a state­ment “The box pic­tured here has been folded together from one of the four choices given. Which one?” A mis­lead­ing ques­tion for sure… since C and D can both work for this.
44. Alex says:

    November 6, 2008 at 9:46

    It cant be “C” b/c when you try to make a square out of it you will get a dupli­cate side and one side will be left open. The only one that makes a square that fits the shapes is “D”
45. Eric says:

    November 10, 2008 at 8:21

    I believe that part of this exer­cise was the mis­lead­ing nature of the ques­tion. One is chal­lenged to look beyond the bounds of the ques­tion. I put much more effort into visu­al­iz­ing and manip­u­lat­ing the two shapes because they both seemed to –and do– work.
46. Tyler says:

    November 10, 2008 at 8:39

    Thanks for the test!
47. deepa says:

    November 13, 2008 at 2:23

    D
48. zeynep evin says:

    November 19, 2008 at 12:50

    the answer is definitly d
49. allstar says:

    December 24, 2008 at 6:45

    c but also d?
50. D. says:

    January 30, 2009 at 1:23

    Pat­terns on C and D seems to be cor­rect. How­ever, sizes of every face of the box on the options given here doens’t seem to match the actual pro­por­tions shown on the box we have as an exam­ple.
    As well as John, my doubt is if this is supossed to be a square.
    Unless the def­i­n­i­tion of my mon­i­tor is wrong, I can’t see any of this options is cor­rect. We can fold boxes, but not exactly the same as the expam­ple that was given.
    Can some­one reply which is the cor­rect one?