Jellyfish

Fish & Wings18 / 32

Four rows, four columns — the largest useful fish.

The fish family scaled to four: four rows confine a digit to at most four cells each, and all of those cells fall into the same four columns. The four columns are then saturated from within the pattern.

Bigger fish than this add nothing in a 9×9 grid — the other five lines would form a complementary smaller fish. So the Jellyfish is where the family tops out.

See it in action

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Step 1 of 4

The setup

Fish hunting scales up: collect rows with two to four candidate cells for one digit, and look for four rows whose column sets merge into exactly four columns. Step through this real position to see it happen.

Practice

Find the Jellyfish and clear its digit from the four covered lines outside the pattern.

Drill 1 of 29

Tap a cell, then the candidate digit you want to remove.