Best for ages 5–7 · Plays offline · No ads, no accounts
Twelve small games built to train fluid reasoning — matrix patterns, working memory, and logic — on ever-new puzzles. Structured around the reasoning abilities standardized intelligence tests measure.
Every block finds its place. So does every child — on their own ladder.
What it trains
Fluid reasoning is the part of thinking that does not depend on what a child has already been taught. It is what culture-fair tests like Raven's Matrices measure, and it is what these twelve games practise — one construct at a time, on puzzles the child has never seen.
Infer the rule behind a set of shapes and pick what comes next — matrix and pattern induction.
Measured by Raven's Progressive Matrices / Cattell Culture Fair — the core of fluid intelligence (Gf-I).
Keep a growing sequence or set in mind and act on it — span and updating.
Measured by Digit / spatial span, n-back (Gwm) — the capacity that gates reasoning.
See numerical relationships and magnitudes — reasoning about quantity, not arithmetic recall.
Measured by Quantitative reasoning (Gf-RQ) — number-relations subtests.
Test whether a statement or choice must be true given the rules — verification and evaluation.
Measured by Logical reasoning (Gf-RG) — deduction and rule-checking.
Build and transform shapes in space — construct a target pattern piece by piece.
Measured by Visual-spatial ability (Gv) — block design, mental rotation.
Produce many valid answers from an open prompt — divergent thinking.
Measured by Divergent production — honestly the weakest link to Gf/IQ; included for range, not as a core claim.
The plan
Most kids' apps hand you a menu of twelve games and hope. We tried that with our own two boys and watched it collapse into one game inside a week. So JaxillMind ships a sequence instead: one ability per week, two games a day, ten to fifteen minutes — then an outside check to see whether anything actually moved.
Daily dose2 games · 10–15 min
Span and updating are the capacity that gates every later construct. Also the children's current comfort zone — starting here means week 1 is adherence-building, not a fight.
Check at the end of the week Digit span forward, then backward (home proxy). Record longest correct span.
First contact with the PRIMARY construct, at its easiest rungs: classify, then extend a rule. Induction is the Gf core, so it gets two full weeks (2 and 3), entry then core.
Check at the end of the week Novel 1-2 feature pattern completion with shapes not used in the games.
THE PRIMARY ENDPOINT WEEK. Odd One Out and What's the Rule? are the two games closest to a Raven's matrix item: infer the governing rule, detect the violation. This is the week the study's headline measure is trained most directly.
Check at the end of the week PRIMARY MEASURE: child-friendly matrix puzzles, novel shapes, 1 changing feature (Axill) / 2 features (Jaxon). This is the headline number.
Quantity reasoning sits on top of induction (a number series IS an induced rule). Placed after the induction weeks so the child brings a rule-finding habit to it.
Check at the end of the week Novel number-relation items: complete the series, order three quantities and explain.
Deduction (must this be true?) requires holding a rule AND testing it — it presumes weeks 1-3. Best Choice adds evaluation on top of verification.
Check at the end of the week 8 novel 'must this be true from the rule given?' items + one 'which is best, and why?' scored on a 0-2 reason rubric.
Construction and generation are the two production tasks — the child makes rather than selects. Last because they are the most open-ended, and because generative is honestly the weakest link to Gf (per the brand node) and must not displace core weeks.
Check at the end of the week Build-to-match a block target + a mental-rotation pick; separately, 2-minute divergent fluency ('uses for a paper cup').
Week 3 is the one that counts most — matrix reasoning is the core of every fluid-intelligence test, and it is the week the outside measure is built around.
Try one
Same shape as a Raven's item — the thing intelligence tests are built from. Find the rule, then pick the missing block. In the app the difficulty climbs as your child gets them right.
That is the ability the whole collection is built around. Week 3 is nothing but this.
Look across, not down.
The rule Every row is one colour.
Now look down.
The rule Every column is one colour.
Two things change at once.
The rule Each row shifts one place to the left.
How it is built
Installs once and plays on a plane, in a car, anywhere. No connection needed, ever.
No sign-up, no email, no password. Open it and play.
Your child's play is stored on your device and stays there. No analytics, no third parties, nothing sent anywhere.
No advertising, no in-game purchases dressed as rewards, no dark patterns aimed at a six-year-old.
The weekly progress report is made on your device. If you want to send it to a teacher, you send it.
Puzzles are drawn without repeats and the difficulty follows your child up, so a session is never a re-run of the last one.
Straight answers
This category has a history. In 2016 the FTC fined a brain-training company two million dollars for telling parents its games made their children smarter, without the evidence to back it. So here is exactly where we stand.
We do not claim that, and you should be sceptical of anyone who does. Practice reliably improves the skill you practise. Whether that carries over into general intelligence is genuinely contested in the research, and we are not going to pretend otherwise on a sales page.
No. Not one. We have designed the games around measured constructs and written the study that could earn a real claim — outside measures, before and after, with a control group at scale. Until that study runs and reads out, this page says what JaxillMind is BUILT to do, never what it has been PROVEN to do.
Six weeks of structured, ten-minute daily practice on the reasoning abilities standardized tests measure, on puzzles that are new every time, with a plan you can follow and a check at the end. That is the whole offer, and it is one we can keep.
None. Matrix reasoning is the core of culture-fair intelligence tests, which is why we build around it. JaxillMind is not affiliated with, endorsed by, or certified by Mensa.
Who it is for
Best for ages five to seven. Twelve games that stay interesting because the difficulty follows them up instead of stopping at a win screen. Ten minutes, then done — it is designed to end, not to keep them.
Down to five because half the games use no words at all — patterns, shapes, sequences and sounds. For the six that ask a short question, a grown-up reads it once and your child does the thinking. Up to seven because that is honestly where these puzzles top out — so that is where we say it fits best, rather than sell you a year your child finishes in a week. Older children are welcome; they will simply move faster.
A weekly page that tells you which ability was worked, how many days it actually happened, and what to check this week. In plain language, with no score to misread.
Price
No subscription, no ads, no in-app purchases. If that ever changes, it will change honestly and it will not change for anyone who already has it.
Coming to the App Store. Works offline once installed.