Finned Jellyfish Sudoku — Expert Fish with a Fin

Almost a Jellyfish for one digit, but one extra candidate—the Fin—changes which eliminations are safe.

How it works

Find the first Column

This Column has a . Digit 4 appears in two or three cells.

Find another matching Column

This Column also has 4 in two cells, and in the same Rows.

Find a third matching Column

This Column lines up too, but it already has an extra 4 candidate.

Find the fourth matching Column

This Column lines up too. All four Columns share the same Rows.

Almost a Jellyfish

Eleven cells line up across four Columns and four Rows, just like a normal Jellyfish.

Spot the Fin

One Column has an extra 4 candidate, the Fin . That extra cell stops this from being a full Jellyfish.

The Fin box

The Fin sits in this . If the Fin is true, 4 must land somewhere in this box on those Rows.

Eliminate in the Fin box

We can safely remove 4 from other cells in the Fin on those Rows.

4
6
8
9
2
3
6
8
7
2
3
6
2
3
6
5
1
4
6
1
4
6
8
9
1
4
9
6
8
9
2
6
8
2
9
2
6
7
4
1
3
6
7
8
9
5
1
3
6
5
3
6
7
8
6
7
9
2
4
6
7
9
4
7
9
2
1
6
7
8
1
4
6
7
1
6
7
4
6
7
5
1
4
7
9
3
4
7
9
1
3
4
1
3
4
7
8
5
4
7
8
1
4
2
6
4
6
7
1
3
5
6
7
1
3
4
9
1
2
3
6
7
2
4
6
7
8
1
4
7
1
4
7
3
1
2
7
8
1
2
1
2
4
6
7
8
9
2
4
6
7
8
1
4
6
1
4
5
6
1
2
4
8
9
4
1
2
9
5
1
2
6
2
6
8
7
1
3
6
1
2
5
1
2
7
6
1
2
4
7
1
2
7
3
9
1
4
8
Find the first Column
This Column has a . Digit 4 appears in two or three cells.
4
6
8
9
2
3
6
8
7
2
3
6
2
3
6
5
1
4
6
1
4
6
8
9
1
4
9
6
8
9
2
6
8
2
9
2
6
7
4
1
3
6
7
8
9
5
1
3
6
5
3
6
7
8
6
7
9
2
4
6
7
9
4
7
9
2
1
6
7
8
1
4
6
7
1
6
7
4
6
7
5
1
4
7
9
3
4
7
9
1
3
4
1
3
4
7
8
5
4
7
8
1
4
2
6
4
6
7
1
3
5
6
7
1
3
4
9
1
2
3
6
7
2
4
6
7
8
1
4
7
1
4
7
3
1
2
7
8
1
2
1
2
4
6
7
8
9
2
4
6
7
8
1
4
6
1
4
5
6
1
2
4
8
9
4
1
2
9
5
1
2
6
2
6
8
7
1
3
6
1
2
5
1
2
7
6
1
2
4
7
1
2
7
3
9
1
4
8
Find another matching Column
This Column also has 4 in two cells, and in the same Rows.
4
6
8
9
2
3
6
8
7
2
3
6
2
3
6
5
1
4
6
1
4
6
8
9
1
4
9
6
8
9
2
6
8
2
9
2
6
7
4
1
3
6
7
8
9
5
1
3
6
5
3
6
7
8
6
7
9
2
4
6
7
9
4
7
9
2
1
6
7
8
1
4
6
7
1
6
7
4
6
7
5
1
4
7
9
3
4
7
9
1
3
4
1
3
4
7
8
5
4
7
8
1
4
2
6
4
6
7
1
3
5
6
7
1
3
4
9
1
2
3
6
7
2
4
6
7
8
1
4
7
1
4
7
3
1
2
7
8
1
2
1
2
4
6
7
8
9
2
4
6
7
8
1
4
6
1
4
5
6
1
2
4
8
9
4
1
2
9
5
1
2
6
2
6
8
7
1
3
6
1
2
5
1
2
7
6
1
2
4
7
1
2
7
3
9
1
4
8
Find a third matching Column
This Column lines up too, but it already has an extra 4 candidate.
4
6
8
9
2
3
6
8
7
2
3
6
2
3
6
5
1
4
6
1
4
6
8
9
1
4
9
6
8
9
2
6
8
2
9
2
6
7
4
1
3
6
7
8
9
5
1
3
6
5
3
6
7
8
6
7
9
2
4
6
7
9
4
7
9
2
1
6
7
8
1
4
6
7
1
6
7
4
6
7
5
1
4
7
9
3
4
7
9
1
3
4
1
3
4
7
8
5
4
7
8
1
4
2
6
4
6
7
1
3
5
6
7
1
3
4
9
1
2
3
6
7
2
4
6
7
8
1
4
7
1
4
7
3
1
2
7
8
1
2
1
2
4
6
7
8
9
2
4
6
7
8
1
4
6
1
4
5
6
1
2
4
8
9
4
1
2
9
5
1
2
6
2
6
8
7
1
3
6
1
2
5
1
2
7
6
1
2
4
7
1
2
7
3
9
1
4
8
Find the fourth matching Column
This Column lines up too. All four Columns share the same Rows.
4
6
8
9
2
3
6
8
7
2
3
6
2
3
6
5
1
4
6
1
4
6
8
9
1
4
9
6
8
9
2
6
8
2
9
2
6
7
4
1
3
6
7
8
9
5
1
3
6
5
3
6
7
8
6
7
9
2
4
6
7
9
4
7
9
2
1
6
7
8
1
4
6
7
1
6
7
4
6
7
5
1
4
7
9
3
4
7
9
1
3
4
1
3
4
7
8
5
4
7
8
1
4
2
6
4
6
7
1
3
5
6
7
1
3
4
9
1
2
3
6
7
2
4
6
7
8
1
4
7
1
4
7
3
1
2
7
8
1
2
1
2
4
6
7
8
9
2
4
6
7
8
1
4
6
1
4
5
6
1
2
4
8
9
4
1
2
9
5
1
2
6
2
6
8
7
1
3
6
1
2
5
1
2
7
6
1
2
4
7
1
2
7
3
9
1
4
8
Almost a Jellyfish
Eleven cells line up across four Columns and four Rows, just like a normal Jellyfish.
4
6
8
9
2
3
6
8
7
2
3
6
2
3
6
5
1
4
6
1
4
6
8
9
1
4
9
6
8
9
2
6
8
2
9
2
6
7
4
1
3
6
7
8
9
5
1
3
6
5
3
6
7
8
6
7
9
2
4
6
7
9
4
7
9
2
1
6
7
8
1
4
6
7
1
6
7
4
6
7
5
1
4
7
9
3
4
7
9
1
3
4
1
3
4
7
8
5
4
7
8
1
4
2
6
4
6
7
1
3
5
6
7
1
3
4
9
1
2
3
6
7
2
4
6
7
8
1
4
7
1
4
7
3
1
2
7
8
1
2
1
2
4
6
7
8
9
2
4
6
7
8
1
4
6
1
4
5
6
1
2
4
8
9
4
1
2
9
5
1
2
6
2
6
8
7
1
3
6
1
2
5
1
2
7
6
1
2
4
7
1
2
7
3
9
1
4
8
Spot the Fin
One Column has an extra 4 candidate, the Fin . That extra cell stops this from being a full Jellyfish.
4
6
8
9
2
3
6
8
7
2
3
6
2
3
6
5
1
4
6
1
4
6
8
9
1
4
9
6
8
9
2
6
8
2
9
2
6
7
4
1
3
6
7
8
9
5
1
3
6
5
3
6
7
8
6
7
9
2
4
6
7
9
4
7
9
2
1
6
7
8
1
4
6
7
1
6
7
4
6
7
5
1
4
7
9
3
4
7
9
1
3
4
1
3
4
7
8
5
4
7
8
1
4
2
6
4
6
7
1
3
5
6
7
1
3
4
9
1
2
3
6
7
2
4
6
7
8
1
4
7
1
4
7
3
1
2
7
8
1
2
1
2
4
6
7
8
9
2
4
6
7
8
1
4
6
1
4
5
6
1
2
4
8
9
4
1
2
9
5
1
2
6
2
6
8
7
1
3
6
1
2
5
1
2
7
6
1
2
4
7
1
2
7
3
9
1
4
8
The Fin box
The Fin sits in this . If the Fin is true, 4 must land somewhere in this box on those Rows.
4
6
8
9
2
3
6
8
7
2
3
6
2
3
6
5
1
4
6
1
4
6
8
9
1
4
9
6
8
9
2
6
8
2
9
2
6
7
4
1
3
6
7
8
9
5
1
3
6
5
3
6
7
8
6
7
9
2
4
6
7
9
4
7
9
2
1
6
7
8
1
4
6
7
1
6
7
4
6
7
5
1
4
7
9
3
4
7
9
1
3
4
1
3
4
7
8
5
4
7
8
1
4
2
6
4
6
7
1
3
5
6
7
1
3
4
9
1
2
3
6
7
2
4
6
7
8
1
4
7
1
4
7
3
1
2
7
8
1
2
1
2
4
6
7
8
9
2
4
6
7
8
1
4
6
1
4
5
6
1
2
4
8
9
4
1
2
9
5
1
2
6
2
6
8
7
1
3
6
1
2
5
1
2
7
6
1
2
4
7
1
2
7
3
9
1
4
8
Eliminate in the Fin box
We can safely remove 4 from other cells in the Fin on those Rows.

All Hints

Unlock hints to find
the Finned Jellyfish on your board.

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