Buy the railroads. Corner the oil. Build the trust before Congress breaks it up.
When time runs out, the round finishes so every player gets the same number of turns. Highest net worth wins. The grand board adds the circus, Coca-Cola, the Gold Room and more, and plays best in 40 minutes or longer. With six or more players, pick the grand board so there are enough businesses to go around.
One Chromebook hosts and gets a code. Everyone else opens this page, types the code, and plays from their own screen. The time limit and auction setting above apply.