Lightning Returns: Final Fantasy XIII

The game must be completed within seven days, which can be extended to thirteen days. The NPCs are in constant movement, changing locations based on how much time has elapsed. The protagonist's skills improve as she completes quests, some of which are optional and can be obtained at the Canvas of Prayer or given by NPCs. Every day at 6, Lightning is taken back to the Ark, where she gives Eradia, an energy bestowed by NPC quests, to the Yggdrasil tree to extend her allotted time.