Nonlinear gameplay

A video game with nonlinear gameplay presents players with challenges that can be completed in a number of different sequences. Each may take on (or even encounter) only some of the challenges possible, and the same challenges may be played in a different order. Conversely, a video game with linear gameplay will confront a player with a fixed sequence of challenges: every player faces every challenge and has to overcome them in the same order. A nonlinear game will allow greater player freedom than a linear game. For example, a nonlinear game may permit multiple sequences to finish the game, a choice between paths to victory, different types of victory, or optional side-quests and subplots. Some games feature both linear and nonlinear elements, and some games offer a sandbox mode that allows players to explore an open world game environment independently from the game's main objectives, if any objectives are provided at all. A game that is significantly nonlinear is sometimes described as being open-ended or a sandbox, and is characterized by allowing players to measure progress through self-determined goals, independent of scripted game elements.