An n-back-style sequence challenge

What a round looks like

In a 2-back round the stream is L, K, L, P. When the second L appears, it matches the letter two steps back, so the answer is Match. P does not match K, so the answer is No match.

Where the idea comes from

N-Back is inspired by this research:

• Owen, A. M., McMillan, K. M., Laird, A. R., & Bullmore, E. 2005. N-back working memory paradigm: A meta-analysis of normative functional neuroimaging studies. Human Brain Mapping.An open-access review of how this task family is used in brain imaging research.
• Melby-Lervåg, M., & Hulme, C. 2013. Is working memory training effective? A meta-analytic review. Developmental Psychology.An important caution: practice tends to improve the practiced task, while gains in general abilities are limited.

Brain Puzzle’s version is an original game round, not a laboratory protocol and not a therapy.

For what large studies found about brain training, including the limits, see what the science actually says.

How it plays in Brain Puzzle

Early levels start with 1-back. Higher levels move to 2-back, use more symbols, and give you less time to answer. We do not claim that practice here improves memory in daily life or raises intelligence.

Difficulty that follows you

Each puzzle type keeps its own level on a scale from 1 to 10, so a strong run in one game does not make another one harder. After every round, the app looks at your recent results for that type.

A steady run of accurate rounds played at a good pace moves the level up one step. A run of rounds with half or fewer answers correct moves it down one step. Quick guesses that turn out wrong never count toward a step up.

The aim is to keep each puzzle challenging but playable. The level describes the game you get, not your intelligence, memory, or health.