In this three dimensional game you need to sort nuts by color on bolts. Tap on a bolt to lift the top nut and then on another bolt to move it. You can only move a nut onto an empty bolt or onto a nut of the same color. You can transfer multiple matching nuts in a single move. The goal of each level is to fill every bolt with nuts of a single color. The game becomes more challenging as the number of bolts and colors increases.