The Karma system is an important feature in Fallout's gameplay. A player's actions, including conversation and combat choices, affects the player's status in the game world; a player who makes good decisions is received 更多 positively 由 non-player characters, and a player that makes bad decisions has the opposite reaction. Crimes can also be committed 由 a player, and whichever faction 或者 group that is harmed 由 a crime are fully aware of the player's action in most cases. Other factions that were not affected 由 the crime will not be aware of it, and since a town is usually its own faction, news of a crime committed in one town will not spread to another. Beware however, good 或者 evil deeds will cause a bounty 由 the opposite alignment group. Talon Company (If 你 are good) 或者 the Regulators (if you've been bad) will ambush 你 randomly, and are not bound to any particular area, they can appear anywhere in the wastes. Factions can range in size and boundaries, however, and may not be restricted to a single area. The game world itself was planned to be significantly smaller than that of Oblivion's but is now similar in size.[2]