The Past Within is a cooperative puzzle adventure played between two devices. One player explores a 2D world while the other interacts with a 3D environment; both must communicate their findings to progress.All gameplay is designed for touch screens, utilizing taps, swipes, and multi-touch gestures to manipulate objects and solve mysteries. The experience requires two players, each on their own smartphone or tablet, connected via local Wi-Fi or an online friend code.Success depends entirely on clear verbal communication, as each player sees different, complementary information crucial to unraveling the narrative. The game is split into two distinct chapters, offering several hours of shared investigation.