Recent investigations of direct CP violation in $B$-meson decays at Belle

We present the recent studies of $B^{0} \to \eta\eta$, $B^{0} \to \pi^{0}\pi^{0}$, $B^{+}\to K^{+}K^{-}\pi^{+}$, and $B^{0} \to K_{S}^{0} K^{+} \pi^{-}$ charmless $B$ decays using a data sample of 772 million $B\overline{B}$ pairs collected at the Belle detector running at the $\Upsilon(4S)$ resonance at the KEKB asymmetric-energy $e^{+}e^{-}$ collider.