About PlayMemorize Odd One Out

PlayMemorize Odd One Out is a free classification and abstract reasoning game. You see a group of items and must identify the one that does not belong. Categories include numbers, emojis, letters, shapes, and math expressions.

Diverse puzzle types. Numeric puzzles test knowledge of primes, squares, cubes, Fibonacci numbers, and divisibility. Letter puzzles use properties like symmetry, curves, and enclosed spaces. Math expression puzzles require mental arithmetic.

Learn as you play. After each answer, the game explains the rule (e.g. "All others are prime numbers" or "All others have enclosed spaces"). Every wrong answer is a learning opportunity.

Part of the PlayMemorize family of free memory and brain training games.