Matrix 5×5

Find the missing number in a 5×5 matrix where rows and columns follow hidden rules.

How to play

A 5×5 grid of numbers follows a rule across its rows and/or columns, with one cell left blank. Work out the rule and fill in the missing value.

• Check rows and columns for a shared arithmetic or pattern-based rule.
• This is the largest, hardest grid — keep track of several rows at once.
• No paper or calculator — do it in your head.

Why this matters

At 5×5 this exercise approaches the difficulty ceiling of Raven's Advanced Progressive Matrices, the variant used to differentiate among high-scoring examinees — including in Mensa-style admission testing — where most standard-difficulty matrix items stop discriminating. Read more about the Raven's Progressive Matrices.

This game trains