Normal Sudoku rules apply.
There are hidden lockout lines in the grid. Each pair of diamonds with the same letter must be connected by a line. Lines can only move orthogonally and cannot branch. Lines cannot cross themselves, other lines, or other diamonds.
Digits on a lockout line cannot be between or equal to the digits on the diamond endpoints. Digits on the endpoints must differ by at least 4.
Here is an example puzzle on a 6x6 grid, with endpoints required to differ by at least 2: