Fill every cell with a digit from 1-8 such that digits do not repeat in a row, column or 4x2 box. There are eight boxes, which overlap at dashed lines, and some boxes wrap around the grid, which is a torus. For example, r1c6 and r4c2 share a box. Adjacent digits on the orange line must differ by at least 4. Digits separated by a V must sum to 5.