Franken Jellyfish

Level 12 · Black Belt

Strategy:

Franken Fish

Overview

Franken Jellyfish is a 4-house Franken fish combining boxes with rows and columns. This is among the rarest fish patterns used in solving.

How It Works

  1. Find a digit restricted to 4 base houses (mix of rows, columns, boxes).
  2. Cover with 4 houses, ensuring at least one box is in the base or cover.
  3. Eliminate the digit from cover cells not in the base.

Example

Starting position

Look for Franken Jellyfish.

1

Found a Franken Jellyfish on digit 2

Found a Franken Jellyfish on digit 2. The base set is: Row 8, Box 1, Box 2, Box 8.

2

2 is confined to the cover set

The cover set is: Column 2, Column 3, Column 4, Column 6. Digit 2 in the base set is confined to these 4 cover houses.

3

Cover-only 2 candidates can be removed

Any 2 in a cover house but outside the base set can be eliminated.

4

Cover candidates outside the base set

These cover-set candidates are outside the base set and must be removed: .

5

Remove 2 from

Eliminate 2 from .

6

Result

Result after applying the technique.

Tips & Patterns

  • Franken Jellyfish are extremely rare and very hard to spot by hand.
  • They represent the upper end of practical fish patterns.
  • Computer solvers are typically needed to find these.