We present a new measurement of time-dependent $CP$ violation in $B^0 \to K^{0}_{S} K^{0}_{S} K^{0}_{S}$, and direct $CP$ violation in $B\to \overline{D^{0}} \pi$. These studies are based on the full Belle data set of $772 \times 10^{6} B\overline{B}$ pairs collected at the $\Upsilon(4S)$ resonance.