A layered iron selenite fluoride CsFe3(SeO3)(2)F-6 1 was hydrothermally synthesized. Single -crystal X-ray diffraction studies show that 1 has a trigonal (P (3) over bar m1) lattice, where [Fe-3(SeO3)(2)F-6](-) blocks of three iron sublayers are separated by Cs cations. Within the block, only Fe(2)F-6 and Fe(1)O3F3 octahedra are magnetically connected via super exchange Fe(1)-F--Fe(2) pathways, giving an S = 5/2 cube tile (dice) lattice. At low magnetic field, 1 exhibits an antiferromagnetic transition at,similar to 130 K, where ferrimagnetic cube tile layers are arranged in a staggered manner. At low temperatures, we observed a field-induced transition to a ferrimagnetic state with a one-third magnetization plateau.