Explicit Random Seeds
The possibility in a game to manually provide a number for generating (pseudo-)random number instead of the game selecting one.
Games often make use of randomness, e.g. through dice or shuffled decks of cards. Computer games make use of algorithms that create sequences of numbers that apparent as random for all practical purposes. These algorithms need an initial number, a seed, to function and games typically provide these automatically; using the current time is a easy solution that provides different numbers each time the game is played. However, some games — especially those that generate new worlds each time they are played — allow players to enter these numbers as Explicit Random Seeds - this makes it possible for players to begin with the same starting position in several different game instances.
Using the pattern
Explicit Random Seeds are used to modify Randomness by allowing players to provide a seed that generates the Randomness in a game rather that it being provided by some automatic means (typically based on what time it is). The pattern is easy to implement rulewise, the challenges being related to interface design rather than gameplay design (Explicit Random Seeds is an Interface Pattern).
Explicit Random Seeds typically are used to allow players means of controlling how Procedurally Generated Game Worlds are created, but they can be used more locally affect the Randomness of setups of Game Worlds or Levels.
The ability to provide Explicit Random Seeds to a game gives players a Freedom of Choice regarding how to use Randomness. It also affects Luck since players who find a lucky starting position in a game supporting Explicit Random Seeds can choose to reuse that lucky start multiple times if they wish.
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