Very easy Used at every level, from very easy puzzles up.
Full House
The last empty cell of a unit
A row, a column or a box with eight digits filled in has one empty cell left and one digit missing: that digit goes in that cell.
It is the simplest technique, and the one that ends most puzzles: as the grid fills up, units with a single gap appear everywhere.
What to look for
Look for a row, a column or a box with only one empty cell.
Example
- The cell it fills, with its digit in green
Practise it
In the app, Learn › Full House sets exercises on real positions, then a full puzzle that needs this technique and nothing harder.