In ancient times there were no computers, but the need for calculations arose and to facilitate the counting process, abacus abacus was invented. At first, planks were used as elements. And then the balls strung on the axle. Such accounts were used in retail outlets until the last decades of the twentieth century. Abacus Belt uses an abacus as the basis for a sorting puzzle. The task is to place balls of the same color on each axis. Click and move the balls until you achieve the desired result in Abacus Belt.
