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Number of Players

Source GameMastery Guide pg. 12
Before a game ever begins it’s up to the GM to decide how many players to invite to play. While there is no f irm minimum or maximum limit to how many players a game can accommodate, this choice is largely a matter of how many players the GM expects he can comfortably manage and what limitations a game’s expected play space present. Although most published adventures present challenges for parties with four characters, any encounter can easily be customized to suit the needs of any size group.

Small Groups

Source GameMastery Guide pg. 12
Groups of two or three can allow for more intense roleplaying, but they require you to carefully craft your challenges to be appropriate for fewer players. You’ll also need to compensate for any major abilities that may be missing from the party.

A simple way to accomplish the latter is to eliminate the need for those abilities. For example, if the party lacks a rogue, you may wish to remove traps and locks from the party’s path. Another method is to introduce an NPC who has the needed abilities—just so long as that NPC doesn’t steal the spotlight. Alternatively, you can give the characters magic items that perform the necessary function, such as healing potions and wands for the party without a healer. Last but not least, if the players are experienced enough to handle it, you might enjoy letting each player play two characters to round out the group.

Large Groups

Source GameMastery Guide pg. 12
Groups of more than six players offer more character options, but they also tend to be louder and harder to manage. The more characters there are, the more complex combat becomes and the longer each person has to wait for his turn, making it easier for distractions and side conversations to get out of hand or for naturally shy players to be overlooked. It’s generally best not to take on more than six players at a time unless you’re experienced enough to make combat move along smartly without looking up a lot of rules. Game aids like the GameMastery Combat Pad also make it easier to keep track of things like initiative with a large group.