Heavily Fortyfived
The brief
Normal sudoku rules apply.
The digit on a fortress is larger than every digit that is orthogonally adjacent to that fortress.
Every fortress contains a different digit.
On a teal index line, the digit in the Nth position along the line (starting from the diamond) indicates the position along the line where the digit N appears. Eg: 3214 would be a valid line; the 1st digit, 3, indicates that the 3rd digit is a 1, and so on.