In Sequence, the computer will think up a random sequence of five colors. The object is to guess this exact sequence in twenty turns or less. For each turn, you guess a sequence of five colors. If you are correct, you win. Otherwise, you will be told, in order, (1) how many of the five colors you guessed are in the solution in the same place as they are in your guess, and (2) how many of the five colors you guessed are in the solution in different places than they are your guess.

The secret sequence of colors will always be five colors in length. However, you may adjust the number of possible colors each element of the sequence may be to 5, 10, 15, or 20. You may also control whether duplicate colors (for example, if "red" appears twice in the secret sequence, it is a duplicate color) are allowed in the secret sequence. Note that allowing duplicates does not necessarily guarantee that the solution will contain duplicates. Also note that regardless of this setting, duplicates are always allowed in your guesses.

You can save your game by bookmarking the page in the game you want to come back to later. This works at any point in the game after you've made your first guess.