  We present a summary of recent studies on $CP$ violation with the Belle
experiment using the final data sample of $772 \times 10^{6}$ B\bar{B} pairs
produced at the Ypsilon(4S) resonance at the KEK asymmetric e^+ e^- collider.
We discuss preliminary measurements of the branching fraction, the polarization
and the $CP$ asymmetries of the decay $B^0 \rightarrow \rho^{+} \rho^{-}$ and
an updated constraint on the CKM angle $\phi_2$ from the $B\to\rho\rho$ system.
Being also related to $\phi_2$, we present a preliminary measurement of the
branching fraction of $B^0\rightarrow \pi^0\pi^0$ decays. Last, a preliminary
model independent dalitz plot analysis of the decay $B^0 \rightarrow
D^0[K_S^0\pi^+\pi^-]K^{*0}$ is presented and its sensitivity to the CKM angle
$\phi_3$ is discussed.
