Sudoku number of graphs

Figures & data

Fig. 1 An extendable coloring with at least two extensions.

Fig. 2 A coloring which is not extendable.

Fig. 3 A Sudoku coloring and its unique extension.

Fig. 4 A Sudoku coloring and its unique extension.

Fig. 5 A Sudoku coloring for $C_6(K_4)$.

Fig. 6 Sudoku colorings of $C_6(K_4)$ and $C_8(K_4)$.

Fig. 7 A Sudoku coloring and its extension for $C_{10}(K_5^{-})$.