Here is another unsolved puzzle from Reddit. What is the pattern on the final domino?

enter image description here

  • $\begingroup$ Should this puzzle have the knowledge tag? $\endgroup$
    – Sneftel
    Commented Feb 18 at 13:19

1 Answer 1


It looks like it should be

a domino with 5 pips on the left and 6 pips on the right


if you view each row of dominoes as a single six-digit number and perform subtraction, you get 524601 - 363245 = 161356.

  • 1
    $\begingroup$ PSE is broken this is a brilliant answer imo +1. $\endgroup$
    – PDT
    Commented Feb 20 at 3:52
  • $\begingroup$ It seems like iq puzzles are really out of fashion these days. A couple of years back this would have had way more upvotes by now. $\endgroup$
    – PDT
    Commented Feb 20 at 3:54
  • 1
    $\begingroup$ @PDT agreed this answer is great. Reddit has a lot of good places for iq test related puzzles where there is a good reception for challenging questions and well thought out responses to them 😃! $\endgroup$ Commented Feb 20 at 4:03

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