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Wrong doubleblock (766)
Instruction:
Blacken some of the empty cells and enter the numbers from 1 to 4 in the remaining cells so that in each row and each column exactly two cells are blacked out and each number occurs exactly once. The numbers on the edge indicate the sum of the numbers that are between the two black cells.
The hints around the grid are all wrong however and are either one more or one less than the correct hints.