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\begin{tikzpicture}[ scale=1.0, fine/.style={circle,draw=black,thick,inner sep=2}, ] \draw[step=1.0,black] (0.75,0.75) grid (6.25,6.25); \draw[step=0.5,gray,thin] (2,2) grid (5,5); \foreach \x in {0,...,6} \foreach \y in {0,...,6} \node[fine] at (2+0.5*\x,2+0.5*\y){ }; \end{tikzpicture}