2
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We have a 2x3 grid numbers like so

6 5 4
3 2 1

Four numbers in any 2x2 sub-grid can be rotated clockwise or anti-clockwise. For example

a b
c d

rotated clockwise becomes

c a
d b

Can you obtain the following grid after 5 such rotations?

1 2 3
4 5 6

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2
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First switch the parity of the $1$ and $4$, and the rest falls into place.

 654
 321
 
 625
 314
 
 365
 124
 
 326
 145
 
 136
 425
 
 123
 456

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