\documentclass{beamer}
\usepackage{xmpmulti}
% a frame can consist of a sequence of overlays
% single overlay
% multiple overlays
% overlay specifications
% third example of incremental effects, we use the facilities of the package xmpmulti and a drawing tool which supports multiple layers. We use xfig, but many other choices are possible.
% The \multiinclude command of the xmpmulti package, in this example, causes the graphics files to appear as overlays.
\begin{document}
	\begin{frame}
			\frametitle{Specifying multiple overlays with graphics files}
			\setbeamercovered{invisible}
				\begin{center}
					\multiinclude[format=pdf,width=3in]{game}
				\end{center}
	\end{frame}
\end{document}