User blog comment:Mckrongs/Monster Hunter Wiki: User Suggestions Board/@comment-112.205.2.206-20101216095249/@comment-2158814-20101219042158

Only 3 players can join not 4. Try going online in the guild hall and if anyone else is near you they can join. If no one is near you and you nead to go online try connecting using ad-hoc or xlink-kia or what ever its called.