Sequence Test 1

This test is just for fun, you won't get any estimate of your IQ. I'd say two or three of the problems are more or less easy while the rest are quite hard. The order of the problems does not reflect their difficulty.

I have double- and triple-checked all problems and they should all be correct. Yes, number 6 is also correct.

If you are convinced that you have found an error or have found a correct solution that does not score, please send me an email

A "hall of fame" listing those who found all nine answers to this sequence test was originally on this page, but the list is now too long and has been placed on its own page.
e-mail address or (nick)name:
This is used for the Hall of Fame if you find the correct answer to all nine sequences - don't enter anything you don't want published on these web pages. In particular, e-mail addresses on web pages tend to attract spam, but if you have a good spam filter that may not bother you.

Problem 1:
. . X
X . .
. . .

. X .
. . X
. . .

. X .
X . .
. . .

X . .
. . X
. . .

. X .
. . .
X . .

X . .
. . .
. . X

. . X
. . .
X . .

Problem 2:
. X X
. . .
. . .

X . .
X . .
. . .

. . .
. X .
. X .

. . .
. . .
. X X

. . .
. . .
. X X

. . .
. . X
. . X

X . .
X . .
. . .

Problem 3:
X X .
. . .
. . .

. X X
. . .
. . .

. . .
X X .
. . .

. . .
. X X
. . .

. . .
. . X
. . X

. . .
. . .
X . .

X . .
. . .
. X .

Problem 4:
X . .
. . .
. . X

. X .
. . X
. . .

. . .
. . .
. . .

. . .
X . .
. X .

. . .
. . .
. . .

. X .
. . .
. . .

. . .
. . .
. X X

Problem 5:
. . .
. . .
. X X

X . .
. . .
. . X

X X .
. . .
. . .

. X X
. . .
. . .

. . X
X . .
. . .

. . .
X X .
. . .

. . .
. X X
. . .

Problem 6:

Problem 7:
. . .
. . X
X . .

. . .
X X .
. . .

. X X
. . .
. . X

X . .
. . .
X X .

. . .
. X X
. . .

. . X
X . .
. . .

X X .
. . .
. X X

Problem 8:
. . .
. X X
. . .

. . X
. X .
. . .

. X .
. X .
. . .

X . .
. X .
. . .

. . .
X X .
. . .

. . .
. X .
X . .

. . .
. X .
. X .

Problem 9:
. . .
X X .
. . .

. . .
. . .
. . X

. . .
. X .
. X .

. X .
X . X
. X .

. X .
. X .
. . .

X . .
. . .
. . .

. . .
. X X
. . .

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© 2001-2008 Andreas Gunnarsson
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