One Disk Per Diagonal

number of columns

3

new game with 3 columns

Objective: one disk per diagonal.

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Each diagonal parallel to the main diagonal (which is blank) is colored with one color. The objective is to have exactly one disk on each diagonal, which is equivalent to finding the adjacency matrix of a graceful graph.

Clicking the button in the

th

i

row and

th

j

column first swaps the shapes (but not the colors) in rows

i

and

j

, and then swaps the shapes (but not the colors) in columns

i,j

.