Fifteen Puzzle: Match the Color

Four empty squares break up a 4x4 grid of colored balls. Fifteen Puzzle: Match the Color uses sixteen round pieces in yellow, blue, red, and gray, then asks for each corner to hold one color group.

How to play?

Slide the balls across the square board and swap positions whenever a route is available. Four vacant spaces remain available on the grid, which gives more room to shift pieces across several cells in one move. Early attempts may stall before the pattern clicks.