Full House
Level 1 · White Belt
Overview
Full House is the most fundamental Sudoku solving technique. It applies when a house (row, column, or block) has exactly eight cells filled, leaving only one empty cell. The missing digit is the only possibility for that cell.
How It Works
- Look for any row, column, or 3x3 block that has exactly 8 cells already filled.
- Count which digits from 1-9 are already present in that house.
- The one missing digit is the solution for the empty cell.
Example
Check box 5 - it has 8 of 9 cells filled in.
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Tips & Patterns
- Always scan the puzzle for Full House opportunities first - they're the easiest wins.
- Full Houses often appear after you've placed several digits using other techniques.
- Check all three house types: rows, columns, and blocks.