The Dojo
One idea per lesson — the frame, the friends, multiplication, division, then the mind.
What the marks mean
Colours mark subject, not importance — jade is not “easier” than wisteria. Hover a pill (tap on phone) for the short version.
Subjects on lesson badges
みとり算 mitorizan columns · jade
かけ算 kakezan multiply · brass
わり算 warizan divide · wisteria
開平·開立 roots · sage
暗算 anzan mental · vermilion
基礎 kiso foundations · ink
Other marks on this screen
算算 san calculate · the seal
稽古稽古 keiko practice rank
級級 kyū grade · gold pill
準備準備 junbi prep
検定 kentei the Hall
配置 haichi placement
Grading Hall
Sit a real paper. Pass marks are the real ones.
Store
Spend 小判 on how the frame looks. The maths never changes.
Profile
Held grade from the Hall. Practice rank from XP. Badges from the work.
Drills
No teaching, just repetition under pressure. Fifteen minutes a day here is worth more than an hour on Sunday.
Sandbox
A free abacus. Move beads by hand, or type a calculation and watch it played out bead by bead with the reasoning spelled out.
reads0
Type
+47, −9, 12×34, 84÷7, or =1234. Or click the beads directly.Codex
Everything the game teaches, in one page you can come back to.