Above you find a 7-block variant of a five-by-five
'three-square cover-uncover sliding puzzle'.
(Note that by using a link on this page outside the game board and its
buttons you will leave the puzzle and go to a different page.)
This third and more complicated variant can be solved in 26 moves.
Should you not be able to manage these seven blocks, there is always the
simplest variant on a five-by-five board,
which, however, is no more than a trial version.
If you think it is time for a larger board, you may first have a look at
simplest variant on a ten-by-ten board.
Once you have cleared the central square of this puzzle in (hopefully)
26 moves, you will see a table of three rows and three columns with some
text and figures.
This same table can be found in
System, except that the two yearly inaccuracies of 0.1% are not shown
It demonstrates how much more accurate the
Metric Calendar is than the
traditionally most freakuently used religious-imperial one.
It also demonstrates that you cannot, need not and must not take anyone
seriously who employs that freak of culture to make statistical
claims about such a thing as the differences between the economic data of
two quarters or, worse, months.