Number Echo

Memorize and repeat number sequences that grow longer with each correct answer.

About This Game

Number Echo is a digit span task — a classic measure of working memory capacity. You hear or see a sequence of numbers and must recall them in the correct order. The sequence grows longer as you succeed.

What It Trains

• Working memory: Holding information in mind while using it
• Auditory/verbal short-term memory
• Attention: Encoding new information requires focused attention

The Science

Working memory capacity — often measured as memory span — is a strong predictor of academic achievement, fluid intelligence, and reading comprehension. The average person can hold 7±2 items in working memory (Miller's Law), though this varies with age and individual differences.

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