These are blue, yellow, read, and black. In Talisman players get to roll a die to determine how far they may move. In this game they only move one territory, but the player may chose in which direction he moves. Each of the three color groups has its own set of encounter cards. When a character moves into a territory, he then draws an encounter card of that color.
Different colors mark different levels of difficulty and benefit in their encounters.
Blue is the easiest Yellow more difficult, and Red the toughest. Some of them have some fairly cool and special outcomes, though its a bit of a pain to always have to reference the book whenever you enter a black territory. The game gives two ways to win. At the very center of the map is a territory with an ugly looking demon like critter the game calls a Chaos Lord. The Chaos Lord has some mystical item if high value.