A fundamental but often overlooked feature of video games is tracking player progression. This ability to lay down the controller and pick up where you left off in the game in another time or place is an expected video game feature. When we talk about storing player progress, we need to talk about everything that the game needs to remember about the player. This may include the last town the player has visited, the character level of the avatar, or how many enemies the player defeated (and should stay down). And then there's the player statistics -- how many times you've swung your sword, how many headshots you did, how many times you defeated your all-powerful father in Hades, your best time, and so on.