Anzan Zen: Mental Math

Anzan Zen is a calm mental math trainer built around flash anzan, the Japanese abacus (soroban) drill: numbers flash one at a time, you add them in your head and say the total out loud. Climb 20 levels, the 10 kyu to 10 dan of the Japanese exam: from two 2-digit numbers up to fifteen 3-digit numbers flashed in 3 seconds.

FLASH ANZAN, 20 LEVELS
Numbers appear one by one and vanish. After the last one, give the sum of them all.
- Levels 1 to 20, from 10 kyu (two 2-digit numbers in 4 seconds) up to 10 dan (fifteen 3-digit numbers in 3 seconds)
- Custom: 3, 5, 10 or 15 numbers, 1 to 3 digits, 1.5, 1.0, 0.7 or 0.4 seconds per number
The levels follow the Japanese flash anzan exam table. They are not an official certification.
One wrong total ends the run. Every level and setting keeps its own record: how many totals in a row you got right, so you can watch your addition speed grow from one practice session to the next.

DICTATION
Nothing on screen. The phone reads the numbers aloud, one by one, the way an abacus teacher calls them out in class. Listen, add them up in your head and say the total when it stops. Choose how many numbers, how many digits and the pace: slow, normal or fast.
Levels 1 to 6 run from 6 kyu (seven 1-digit numbers) to 1 kyu (ten numbers of 2 to 4 digits, lengths mixed within a round), following the Japanese dictation exam table. They are not an official certification.

CHAIN, ON SCREEN OR READ ALOUD
A running total that never sits still. Start with 7 + 5, then × 12, − 9, ÷ 4. The total is never shown: hold it in your head and answer each step within 10 seconds. It is mental arithmetic that trains working memory as much as speed. Play it on screen, or pick Audio: the phone reads each step aloud and the screen stays blank.

ANSWER BY VOICE
Just say the number. No tapping, no hunting for keys, so your eyes and focus stay on the numbers. Speech recognition is provided by Google's speech service on your phone; Anzan Zen does not record or store your audio. Somewhere quiet? The keypad is always there.

WHO IT IS FOR
- Soroban and abacus students who want flash anzan and dictation practice at home
- Anyone working toward the next grade and a faster mental count
- Kids building mental arithmetic, addition facts and number sense
- Adults who want a few focused minutes of brain training a day
- Former abacus learners getting their old speed back

CALM BY DESIGN
No noise, no clutter, nothing competing with the numbers. Short arithmetic drills that feel more like quiet math games than homework. Available in English, Japanese, Korean, Chinese (Simplified and Traditional) and Russian.

FREE AND PRO
Free: both chains, Flash levels 1 to 5, Dictation level 1, and voice answers in every game.
Pro, a one-time purchase through Google Play with no subscription: Flash levels 6 to 20 with your own settings, and Dictation levels 2 to 6.

Made by the studio behind Math Zen.

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