\tikzstyle{num} = [rectangle, minimum width = 0.6cm, minimum height = 0.6cm, text centered,align=center,thick,draw = black,fill=black!5]


\begin{tikzpicture}[node distance = 0cm]
\node(num1)[num,fill=red!10]{1};
\node(num2)[num,below of = num1,yshift= -0.6cm,fill=red!10]{5};
\node(num3)[num,right of = num1,xshift= 0.6cm,fill=red!10]{1};
\node(num4)[num,below of = num3,yshift= -0.6cm,fill=red!10]{6};
\node(num5)[num,right of = num3,xshift= 0.6cm,fill=green!10]{2};
\node(num6)[num,below of = num5,yshift= -0.6cm,fill=green!10]{7};
\node(num7)[num,right of = num5,xshift= 0.6cm,fill=green!10]{4};
\node(num8)[num,below of = num7,yshift= -0.6cm,fill=green!10]{8};
\node(num9)[num,below of = num2,yshift= -0.6cm,fill=yellow!10]{3};
\node(num10)[num,below of = num9,yshift= -0.6cm,fill=yellow!10]{1};
\node(num11)[num,right of = num9,xshift= 0.6cm,fill=yellow!10]{2};
\node(num12)[num,below of = num11,yshift= -0.6cm,fill=yellow!10]{2};
\node(num13)[num,right of = num11,xshift= 0.6cm,fill=blue!10]{1};
\node(num14)[num,below of = num13,yshift= -0.6cm,fill=blue!10]{3};
\node(num10)[num,right of = num13,xshift= 0.6cm,fill=blue!10]{0};
\node(num16)[num,below of = num10,yshift= -0.6cm,fill=blue!10]{4};

\draw[->,thick]([xshift=0.4cm,yshift=-0.4cm]num8.east)--([xshift=1.5cm,yshift=-0.4cm]num8.east);

\node(num17)[num,right of = num8,xshift= 2.5cm,fill=red!10]{6};
\node(num18)[num,right of = num17,xshift= 0.6cm,fill=green!10]{3};
\node(num19)[num,below of = num17,yshift=-0.6cm,fill=yellow!10]{8};
\node(num20)[num,below of = num18,yshift= -0.6cm,fill=blue!10]{4};

\node [right of = num20,xshift= 0.7cm]{};

\end{tikzpicture}