Matrix completion
New in this formatA grid of figures follows rules across its rows and down its columns; pick the missing corner.
Target: 1:00 per question
How to attack it
- Read the matrix row by row, then column by column.
- Apply each rule separately; most matrices use two.
- Combine both rules for the missing cell.
More examples being written.
Format last checked: 5 October 2026 · See the format