Built for soroban teachers — not adapted for them.

Open an arena from the portal and read out the join code. Every student answers the identical problem set at the same moment, standings move while they work, and it ends on a podium. It takes about a minute to set up.

• ✓Students join by code or link — no account, no download, any phone or tablet
• ✓Everyone gets the same questions in the same order, so the result is actually a ranking
• ✓Live standings during the round, podium and full scores at the end
• ✓Or run the competition paper — 200 questions in 8 minutes, categories A to I — when you are training for the real thing

Build the set, copy the link, paste it into the class or family group chat. Students tap it and start. There is nothing to hand out, nothing to collect, and no login standing between a child and their practice.

• ✓One link per assignment, opens straight into the drill on any device
• ✓Download the same set as a printable worksheet with a matching answer key
• ✓Close the assignment when the deadline passes, or leave it open for catch-up
• ✓Attempts arrive as students finish — you never chase anyone for a submission

Results are not a percentage. Every attempt comes back question by question: what you asked, what they answered, how many tries it took and how long they sat there. The weak spot is usually visible in about ten seconds.

• ✓Per student: every attempt, their best score, and whether they are still mid-way through
• ✓Per question: expected answer against the given one, correct, wrong or skipped, retries and seconds
• ✓The pattern shows itself — the same complement, the same digit width, the same hesitation, every time
• ✓You walk into the next class already knowing who to sit next to