App Inventor: Colors change incorrectly when moving items between lists (Ball/Nut Sort game)

[ABG]

@Mozhde_Mohamadi

example of a stable list-of-lists move pattern in App Inventor would be greatly appreciated.

The lack of movement ability of the object in one direction but the ability to move in the opposite direction in abacus

This is a zero Sprites total redraw approach. I switched from dragging to touching because it felt more natural to a touch screen, and was simpler to code. abacus_n_columns.aia (6.0 KB) [blocks] [Designer] [sample run]