  Levelness and almost Gorensteinness are well-studied properties on graded
rings as a generalized notion of Gorensteinness. In the present paper, we study
those properties for the edge rings of the complete multipartite graphs,
denoted by $\Bbbk[K_{r_1,\ldots,r_n}]$ with $1 \leq r_1 \leq \cdots \leq r_n$.
We give the complete characterization of which $\Bbbk[K_{r_1,\ldots,r_n}]$ is
level in terms of $n$ and $r_1,\ldots,r_n$. Similarly, we also give the
complete characterization of which $\Bbbk[K_{r_1,\ldots,r_n}]$ is almost
Gorenstein in terms of $n$ and $r_1,\ldots,r_n$.
