Some nonlinear games open up their structure and let the players loose. They provide a very wide possibility space and make it nearly impossible to predict how the player will reach the end. Such titles still come with a defined set of winning and losing states, and often a carefully crafted main storyline, but any attempts at plotting the player journey are futile.
In such games, players are set free to roam and explore the content and gameplay systems, making each playthrough unique. Some series, such as Fallout, Elder Scrolls, Just Cause, or Grand Theft Auto, do it by providing an open world and filling it full of optional activities and missions that can immerse their players for hundreds of hours. Others, such as Civilization ...
