Global Effect puts a new spin on the "conquer-thy-neighbor" genre by focusing on the environmental impact of players’ decisions. For instance, let loose a nuke or two and observe the result on grasslands, or grow more trees and reap the benefit. It is also among the first real-time games that offer multiplayer support, although the confusing interface detracts a little from the fun. Global Effect involves building up a sound local economy before going out to attack other nations and rule the world. Cities must contain housing, food sources, and power supplies. If the player has built a fully functional city with military units, the units can be directed off into battle. The game was published in 1992 by Millennium Interactive Ltd.