FINAL FANTASY XIII is an action-packed role-playing game set in a futuristic world ruled by a theocratic government and a mechanical creature called fal'Cie. The protagonist, Lightning, is a former soldier who joins a resistance movement to save her sister, who has been marked by fal'Cie. The game's key feature is its complex combat and development system.

The battle system in FINAL FANTASY XIII is fast-paced and requires strategic thinking. You can control only one character at a time, but three characters can take part in a battle. You need to choose the actions that your character will perform, but the amount is limited by the Active Time Battle bar. Additionally, the Paradigm system allows you to assign roles to your characters to make the battle more effective.

The development system in the game is called the Crystarium. It consists of ten levels that allow you to upgrade your stats, such as health, strength, and magic. Crystarium Points are earned by defeating enemies, which encourages players to engage in battles frequently to improve their stats.