Colorfast

Colorfast is an abstract game where players each represent a primary color. On their turn, players will either place a cube of their color, or convert an existing cube to another color that is one away from the current one on the color spectrum (red, orange, yellow, green, blue and purple). The object is to get five cubes in a row made of your primary color and any derivative secondary colors (e.g. red, purple and orange). When (re)placing cubes, players may not choose a space that is adjacent (orthogonally or diagonally) to one of the last two pieces played on.

Rules are changed slightly for the 2 player game, having each player also take a turn with a neutral color (yellow).