Known as 911: First Responders in North America, Emergency 4 boasts several improvements in user-friendliness. For instance, it is possible to dispatch several vehicles at the same time, order them to arrive at a specific location, there's a simple counter for the number of casualties in the area of operations, and idle emergency physicians seek out nearby untended casualties. The game contains 20 missions, with mandatory free play intermissions at every interim, and the Endless and Challenge free play modes. It is also the first in the series to support multiplayer gameplay and supports modding. A deluxe release includes three extra missions, support for voice commands, etc.