Invader Sudoku – Expert

A expert Sudoku puzzle whose given clues form the shape of a invader, with 38 clues. Every special-shape puzzle on this site is also a regular Sudoku with a single unique solution, and requires these techniques to solve: Naked Single, Hidden Single, 2-String Kite, W-Wing, Finned X-Wing, Unique Rectangle, XYZ-Wing, XY-Wing, XY-Chain.