It is a simple but addictive game in which the goal is to guess a word of five letters. The word - which is different every day, but the same for all players - can be shown six times, and players are offered clues during the game that make it easier to guess.
After each guess, each letter is marked as green, yellow, or gray: green means the letter is correct and in the correct position, yellow means it's in the answer but not in the right place, while gray means it's not in the answer at all.