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Infection (Killer) (1238)
Instruction:
Fill some cells with a number from 1 to 4. All numbered cells must be orthogonally connected. Orthogonally adjacent cells cannot contain the same number. Each number must indicate the number of orthogonally adjacent numbered cells.
Some groups of cells are indicated by a dotted "cage"; the sum of all numbers in the cage is provided in the corner of the cage. The same number can show up in a cage more than once.