The gold standard of brain training. Track positions AND sounds simultaneously, then recall what happened N steps ago.
A square lights up on a grid while a letter is spoken aloud. You need to remember both and signal when either the position or the sound matches what happened N turns ago. This is one of the few exercises with strong research evidence for improving fluid intelligence.
Most beginners start at 2-back. Reaching 4-back or higher is a sign of exceptional working memory.
Working memory is how you hold new information while making sense of it. Stronger working memory means faster learning in any subject.
Complex problems require you to juggle multiple pieces of information at once. This exercise expands that mental workspace.
Remembering what you were doing, what comes next, and what you need — all at once — relies on the same skill this trains.