Every reckoner in the North once stood where you stand. The tables from 1 × 1 to 12 × 12 look like a mountain — but there is a path up it, and it is shorter than it looks. Walk the four halls in order.
Learn what multiplication truly is, the secret that cuts the mountain in half, the wisest order to learn the tables, and a trick for every one.
Explore every table from 1 to 12. Tap any fact to see it as an army of stones. Chant the skip-counts until they sing.
Prove your memory. The trial watches which stones you stumble on and brings them back until they shine gold.
Use your skill in the world: crates of fish, benches of rowers, bundles of arrows, hoards of silver. Earn your rank.
Every module in one view — what is finished, what remains, and how far up the mountain you stand. For student and teacher both.
Chant the stones aloud, forward and back. Tap any line below to see it built from stones.
Choose your ground. There is no clock in this hall — only sureness. A missed stone costs nothing, but it returns within this very trial, again and again, until you answer it truly. Across many days, three true answers in a row turns a stone gold.
The hidden-factor riddles are division wearing a helmet. They build both skills at once.
Every module in the four halls, and how far up the mountain the reckoner stands. For student and teacher alike.
This game saves everything on this device, in this browser only — nothing is sent anywhere, and no account is needed. That means progress is erased if you clear your browser's cache, site data, or history, use Private/Incognito windows, switch to a different browser or device, or let a "clean-up" tool run.
To keep a record, write down or screenshot this page now and then. If you have several children, give each their own browser profile or device — they share one save otherwise.