Jigsaw Sudoku

Jigsaw Sudoku (Chaos Sudoku, Kikagaku-Sudoku, Shape Sudoku, Irregular Sudoku, Geometric Sudoku, Nonomino Sudoku) is a logic puzzle. In this Sudoku variant, the blocks are not square but irregularly shaped.

Rules: In this variant of the Sudoku puzzle, the blocks are randomly shaped.
In each cell of the NxN grid, enter a number in the range 1–N. Each number must appear exactly once in each row, column, and block.