# Hidden Quad

From Sudopedia

Jump to navigationJump to searchA **Hidden Quad** is a Hidden Subset of size 4.

When all candidates for 4 digits in a house are limited to only 4 cells, these cells must contain these 4 digits. Subsequently, all remaining candidates can be removed from these 4 cells.

## Example

The following example shows a Hidden Quad in the 6th box.