The Shadowrun game mechanics are based entirely on a 6-sided dice system. The game is skill-based rather than class-based, but archetypes are presented in the main book to give players and gamemasters an idea of what is possible with the system.
Before the fourth edition, skill and ability checks worked as follows: all actions in the game, from the use of skills to making attacks in combat, are first given a target number that reflects the difficulty of the action which is then raised or lowered by various modifying factors, such as environmental conditions, the condition of the character, the use of mechanical aids, and so forth. The player then rolls a number of dice equal to their level in the relevant skill, and the number of dice rolled that meet or exceed the target number determines if the character is successful performing the action and the degree of success the character has. As an example, a character with a high firearms skill not only has a better chance at hitting a target than someone with a lower ranked skill, but also is more likely to cause more damage to the target. For an action with a target number of 6 or less, a dice roll of 6 allows an extra dice to be rolled, increasing the chance of greater effectiveness. Target numbers may exceed 6, in which case any dice that show a 6 have to be re-rolled (a target number of, e.g., 9 is reached by rolling a 6 followed by at least a 3; thus, a target number of 6 and one of 7 are identical, except extra dice rolls are not allowed for target number 7 or greater). For even higher target numbers, this procedure has to be repeated; thus, an action with a target number of 20 (like attempting to procure military-grade weaponry) will only succeed if three successive dice rolls result in sixes, and the fourth gives at least a 2. For any dice-roll a roll of 1 always counts as a failure. This system allows great flexibility in setting the difficulty of an action.
In addition to this basic mechanic, players can use several task-specific dice pools to add bonus dice to certain tests, though dice that are used do not refresh until the end of a turn. This adds an extra tactical element, as the player must decide where best to spend these bonus dice. For example, combat pool dice could be spent to improve attacks or to improve defense, or some of each. Players also have Karma Pool that can be used to reroll any dice that failed to reach the target number. Karma Pool refreshes rarely, typically once per scene or less, at the GM's discretion. The combination of Karma Pool and dice pools gives players a considerable amount of freedom to decide how important a task is to their character. Two characters with identical statistics could perform very differently on the same tasks depending on their priorities (and thus, allocation of dice pools and Karma Pool).
In the fourth edition, things have changed substantially. The game still runs on six-sided dice, but now each task is given a threshold. The player then rolls dice equal to their skill plus the relevant attribute modified by applicable modifiers. The number of fives and sixes is equal to the number of hits. Hits above the threshold indicate extraordinary performance. Furthermore if more than half the dice rolled are ones, then the player has made a glitch. Glitches cause bad things to happen to the player and game masters are encouraged to be inventive and funny.
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Famous quotes containing the word mechanics:
“It is only the impossible that is possible for God. He has given over the possible to the mechanics of matter and the autonomy of his creatures.”
—Simone Weil (19091943)
“the moderate Aristotelian city
Of darning and the Eight-Fifteen, where Euclids geometry
And Newtons mechanics would account for our experience,
And the kitchen table exists because I scrub it.”
—W.H. (Wystan Hugh)