Starting from this thread How to make box in a row of a table. I'm also aware of Highlight elements in the matrix I'm just wondering if there is any quick way like this to create a box spanning across rows and columns rather than having to use TikZ
\documentclass{article}
\usepackage{xcolor}
\def\boxit#1{%
\smash{\color{red}\fboxrule=1pt\relax\fboxsep=2pt\relax%
\llap{\rlap{\fbox{\vphantom{0}\makebox[#1]{}}}~}}\ignorespaces
}
\begin{document}
\begin{tabular}{| c | c c c c | }
\hline
Location & \multicolumn{4}{c|}{Rounds}\\
\hline
0 & 2 & 23 & 41 & 42\\
\boxit{1.47in} 1 & 3 & 24 & 42 & 43\\
2 & 4 & 25 & 43 & 44\\
3 & 5 & \boxit{0.77in} 16 & 26 & 34\\
4 & 6 & 17 & 27 & 35\\
\hline
\end{tabular}
\end{document}

TikZ. – OrangeEfficiency Jun 07 '19 at 13:29