I set out to make an extreme puzzle and asked my sudoku creator to give me several grids all with the same solution. Once it had produced around 70, it came up with this one, which had a Hodoku grade of Extreme (6092):
I checked this grade with Andrew Stuart's grader and solver, which could not find a solution:
I clicked the Take Step button repeatedly until the solution was found and saw that Bowman's Bingo (Trial and Error) was used several times.
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