Windfall: The Oil Crisis Game is a real-time business simulation game developed by David Mullich in 1980 for the Apple II. Based upon queuing theory and released after the 1979 energy crisis, the game puts the player in the role of chief executive of Engulf Oil, setting gas prices and worker salaries, monitoring gas station lines, scheduling oil tanker arrivals, and negotiating oil prices with OPEC countries in a race against the clock to maximize profits.