Franken Jellyfish

Level 11 · Red Belt

Strategy:

Franken Fish

Requires:

Franken SwordfishJellyfish

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

Look for Franken Jellyfish.

1

Franken Jellyfish

Found a Franken Jellyfish on digit 1. The base set is: Row 5, Row 6, Row 9, Box 1.

2

Franken Jellyfish

The cover set is: Column 1, Column 2, Column 4, Column 5. Digit 1 in the base set is confined to these 4 cover houses.

3

Franken Jellyfish

Any occurrence of 1 in the cover houses that is NOT in the base set can be eliminated.

4

Franken Jellyfish

These highlighted cover-set candidates are outside the base set and must go: .

5

Franken Jellyfish

Eliminate 1 from .

6

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.