\begin{table}[t!]
\caption{Action space reduction.}
\label{table:action_space_reduction}
% \vspace{-5pt}
\centering
\begin{adjustbox}{width=0.48\textwidth}%\setlength{\tabcolsep}{4pt}
\begin{tabular}{cccccc}
\toprule
\multicolumn{3}{c}{\makecell{DoorKey}} & \multicolumn{3}{c}{\makecell{Sokoban}}\\
\cmidrule(lr){1-3}
\cmidrule(lr){4-6}

Easy& Normal& Hard& Easy& Normal& Hard\\
\midrule
66.7\% & 75.0\% & 80.0\% & 46.7\% & 88.9\% & 95.2\% \\
\bottomrule
\end{tabular}
\end{adjustbox}
% \vspace{-0.5cm}
\end{table}