BrainGym

Brain training, one drill at a time

Eight exercises, each training one specific mental skill.

No lectures, no worksheets — just a short, focused drill for one skill at a time: math facts, working memory, attention, estimation, reading recall, task-switching, and inhibitory control.

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No account needed for the free exercise. It stays free.

How it works

One skill, one drill

Each exercise trains exactly one thing — a math fact, a running total, a sequence of squares — so there is never any doubt about what got better.

Ranks, not scores

Most exercises use a simple rank ladder that moves with real performance, not time spent. Get sharper, rank up.

Nothing is collected

No analytics, no tracking, no learner accounts. If you sign in, the account belongs to you, the adult.

Exercises available now

Free forever

The Ledger

working-memory updating (verbal/numeric) — holding and updating a running total across a chain of steps.

Track a running total through a chain of plus and minus steps, entirely in your head.

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The Nets

math-fact fluency via retrieval practice / spaced repetition (a 3-box Leitner system).

Drill multiplication facts with a spaced-repetition system that shows your weak spots more often.

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The Auditor

attention to detail / error-spotting (proofreading under time pressure).

Spot the one wrong number hidden in a receipt, under time pressure.

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The Vault

spatial working memory (a Corsi-block-style sequence recall task).

Watch a sequence of lit-up squares, then tap them back in the same order.

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The Appraiser

estimation and magnitude judgment, with a commit-before-reveal structure (state your guess before seeing the true value, forcing genuine estimation rather than adjustment).

Estimate a real number before it's revealed, and see how close your gut gets.

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The Briefing

reading comprehension via retrieval, not re-scanning (the passage is not visible while answering).

Read a short passage, then answer questions about it from memory alone.

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The Switch

cognitive flexibility / task-switching (the "switch cost" paradigm from cognitive psychology).

Switch between two rules on the fly and see the cost it takes on your reaction time.

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The Signal

inhibitory control / selective attention (a classic Stroop color-word interference task).

Name the ink color, not the word — a classic test of ignoring what a word says.

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Where this is up to. BrainGym is early. All eight exercises are live and finished: The Ledger is free for anyone, and the other seven open with a sign-in.