Possible candidate of 0^+ s\bar{s}s\bar{s} state

The possibility of the $0^+$ $\eta\eta$ resonance $f_0(2100)$ as a candidate of the $Q^2\bar{Q}^2$ state $C^{ss}(36)$ is explored. The $\eta\eta$ channel of $f_0(2100)$ is the dominant decay mode, $\eta\eta'$ channel has less decay rate, the decay rate of the $\eta'\eta'$ channel is very small. The $\pi\pi,\;K\bar{K},\;4\pi$ modes are at next leading order in $N_C$ expansion. Other possible decay modes are discussed.