Sorobaco

什么是 Sorobaco？

Sorobaco is not a math game. It is not a calculator trainer. No score, no levels, no explicit feedback. The system watches how you use the Soroban, your hesitations, errors, recovery time, rhythm and adjusts its pressure in response. Three phases gradually take you from full equation visible to pure mental operation, building toward Anzan: arithmetic without reference. The session ends when cognitive friction crosses a threshold. No announcement, no game over screen. The flow simply stops.