Exploring the chiral regime with dynamical overlap fermions

I report the status of the dynamical overlap fermion project by the JLQCD and TWQCD collaborations. So far, the simulations have been completed with two flavors of overlap sea quarks in a wide range of sea quark mass corresponding to the p-regime and the ε-regime on a 163 ×32 lattice at a =0.12 fm. More recently, runs with 2+1 flavors of sea quarks have also started. This talk mainly discusses the physics results on the N f = 2 lattice after describing the lattice formulation and algorithms.