Phantasy Star - Generation:1 is a remake of Phantasy Star. The remake retains many cardinal aspects of the original, including story, characters, basic battle system, and first-person 3D dungeon navigation. However, the remake has a noticeably more linear progression, generally not allowing free-roaming and exploring locations outside of the order prescribed by the plot. Typically, specific dialogues are now needed to trigger an event that would lead the player to the next destination. Instead of one dungeon key that allows exploring any dungeon, each one has a particular key that has to be obtained in a unique fashion. Also, several locations that were optional in the original game are now mandatory.