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of the patterns that these numbers

make. Use them or enter new ones

and then click To understand the structure, move the

mouse over the blue arrows and wait.

Look at the pattern that your selection

produces in the square belowThe Bottom Right number

(under the blue down arrow)

above is the first number in

the sequence for the square.

By convention it is "1", but

any number can be used.

If you change the bottom row

above and try using "3,2,1,0"

instead, do you get the same

result as "2,1,0,1"? You can also try experimenting

by writing in your own numbers

in the red squares. To see the

totals, press

The numbers at the top and

the left are the sums for the

diagonal rows - including the

broken diagonals.