Ages 5–8 · place value dojo
A 123‑question check across kindergarten, first and second grade that finds what a child actually understands — then ten games aimed at exactly the gaps it finds.
🎓 Ninja Trials
123 questions across ten strands, spanning kindergarten, first and second grade. Each strand ladders up through the grades and stops after two misses, so nothing drags. Questions are sampled fresh each run — or switch on Deep Dive to ask every one. About two to three minutes a strand; one a day works fine.
A number's name sometimes hands you its place value — “two hundred thirty‑five” is 200+30+5 out loud. Sometimes it buries it: “thirteen” names the ones first and never mentions a ten. Ask only the first kind and a child looks fluent. Every skill here is asked both ways.
Teaching during a diagnostic contaminates every item after it. Right and wrong get the same warm “got it!”, and the real feedback lands at the end — so what comes out is what she knew walking in.
Not “7/10 on subtraction”. Instead: 83−27 came to 64 — the ones were done as 7−3 instead of 3−7, with why that happens and which game fixes it. Errors like that are a rule being applied consistently, not carelessness.
🎓 Learn the secrets
Most early maths trouble isn't arithmetic — it's these three ideas going unsaid. Each one gets its own hands-on lesson before any game asks about it.
Fourteen and forty‑one sound like cousins and get mixed up for years. The lesson slows the words right down so the difference becomes obvious — and audible.
The Number Machine has three houses. Fill the ones house past nine and ten cubes visibly bundle into a rod and move next door. Nobody has to be told the rule.
"Carrying" is just trading ten smalls for one big because the house is full. Once that lands, regrouping addition stops being a memorised dance.
🎮 Play & earn stars
Every correct answer is a star. Five in a row opens a mystery chest with a ninja friend inside. Tap any game to jump straight in.
🥋 The belt ladder
Stars add up to belts. The bar on the home screen always shows how many stars are left to the next one — the reason to do "just one more round".
👋 For grown-ups
No sign-up, no data leaving the device, nothing to buy. Add it to a tablet home screen and it opens like a normal app, with or without wifi.
🥋 Open the dojo