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This application is the lite version of Mr. Abacus game (market://details?id=com.bbk.mrabacus), it simulates the Japanese abacus (soroban), it gives you addition (and subtraction) problems to solve in the shortest time, it can teach abacus addition (and subtraction) to kids and adults.
- Add time chase mode.
- Add mental mode.
- Add slide (drag) mode to move the beads (done :) )..