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The world's hardest irregular sudoku: https://puzzling.stackexchange.com/questions/93766/your-task-is-to-create-the-worlds-hardest-irregular-sudoku
The joke is that the puzzle itself is easy. "Hardest" means only that it has few givens. The meta-puzzle is to construct the puzzle: a 9x9 grid divided into 9 9-ominoes (analogous to the 3x3 blogs of standard sudoku), with as few grid cells as possible specified as givens so that there is a unique solution.
puzzling.stackexchange.comYour Task Is to Create the World's Hardest Irregular Sudoku!Ahem, let's formalize your task...
A Sudoku is a puzzle consisting of a grid to be filled with symbols, such that each constraining unit contains each symbol exactly once. The regular Sudoku is a ...