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Coral with questionmarks (758)
Instruction:
Blacken some of the cells in the grid to create a coral. All black cells in the coral must be orthogonally connected. There must be no 2x2 squares of black cells. And all white cells must be connected to the edge of the grid. The numbers on the edge indicate the lengths of successive blocks of coral fields. In this puzzle they are in the correct order. There must be at least one blank cell between two blocks.
All numbers 2 are shown. Questionmarks are used for all the other numbers (1, 3 and more).