New in 1.1: Updated for Windows Phone 7.5 fast app switching. Improved touch support and other bug fixes. A virtual simulation of a Japanese soroban (abacus). Provides a standard set of 13 columns, with every 3rd column marked as unit column for reference. Choices of two different bead styles. Multi-touch enabled to allow for standard pinching gestures to manipulate heaven and earth beads simultaneously. Practicing daily with the soroban helps improve mental agility, not just in mathematics, but also in other areas of logical and critical thinking. Feedback welcome at junannamono@live.com