6×6 杀手数独

6×6 Killer Sudoku is the mini version of the cage puzzle: six 2×3 boxes holding the digits 1 to 6, carved into cages whose target sums are the only clues — there are no given digits. Its short cages mean forced combinations appear early, so it is the gentlest way to learn how a cage sum and its length pin down the digits inside.

It is the place to build the cage-combination habit — reading a sum like "two cells make 3" as "only 1 and 2" — before stepping up to the full 9×9 Killer board.

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