Underponder — developed by one person since December 2015, is a first-person computer puzzle platformer game with a strange and exciting atmosphere that evokes a sense of confusion and loneliness while wandering in a strange space of mind known only as The Underponder. Without a visible user interface, the player crawls on different levels in search of tips on how to move forward. At the end of each card is a cinematic video. These videos develop the story, gradually unraveling the mystery. Along with the familiar keyboard binding setting known to every FPS player in the world, the game has a unique game mechanics based on hearing.