Observed arrival · 2026-09-08
Soroban Kingdom, a Tiny Abacus Training Realm
A free, registration-free Japanese practice app for children learning soroban arithmetic, from beginner grades through tenth dan.
Field notes
Soroban Kingdom organizes practice around selectable grades and dan levels, with separate tracks for reading numbers, multiplication, division, flash calculation, and mental arithmetic. Learners can use the displayed abacus or enter answers numerically, and a 20-question test mode sets a 140-point passing threshold. Progress features include daily practice, streaks, records, rankings, and a parent view showing recent-30-day accuracy by subject. Puzzles and a four-heart battle mode add game mechanics without obscuring the arithmetic focus.
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