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Hidden Single

Easy

When there's only one Cell left in a Row, Column or Box, that's able to be a , that's called a Hidden Single.

How it works

5
1
7
2
6
1
6
5
4
9
3
1
4
5
3
5
9
1
7
3
6
2
9
7
2
9
1
5
1
2
8

Last cell left

Find the last cell that can be a 1 in this row.

5
1
7
2
6
1
6
5
4
9
3
1
4
5
3
5
9
1
7
3
6
2
9
7
2
9
1
5
1
2
8

Every other cell is ruled out

This is the only cell in this row that can be a 1.

5
1
7
2
6
1
6
5
4
9
3
1
4
5
3
5
9
1
7
3
6
2
9
7
2
9
1
5
1
2
8

The cell must be a 1

We know there must be a 1 in this row, and this is the only spot left!So we can now be certain this Cell is a 1.

5
1
7
2
6
1
6
5
4
9
3
1
4
5
3
5
9
1
7
3
6
2
9
7
2
9
1
5
1
2
8

TIP: Highlighting

One at a time, move your cusor over other 1 to hightlight regions and reveal hidden singles.

All Hints

Unlock hints to find
the Hidden Single on your board.

Next up

Locked CandidateEasy