The Fountain of Objects game is a 2D grid-based world full of rooms. Most rooms are empty, but a few are unique rooms. One room is the cavern entrance. Another is the fountain room, containing the Fountain of Objects. The player moves through the cavern system one room at a time to find the Fountain of Objects. They activate it and then return to the entrance room. If they do this without falling into a pit, they win the game. Unnatural darkness pervades the caverns, preventing both natural and human-made light. The player must navigate the caverns in the dark, relying on their sense of smell and hearing to determine what room they are in and what dangers lurk in nearby rooms.
You have made your way to the Cavern of Objects, high atop jagged mountains. Within these caverns lies the Fountain of Objects, the one-time source of the River of Objects that gave life to this entire island. By returning the Heart of Object-Oriented Programming—the gem you received from Simula after arriving on this island—to the Fountain of Objects, you can repair and restore the fountain to its former glory. The cavern is a grid of rooms, and no natural or human-made light works within due to unnatural darkness. You can see nothing, but you can hear and smell your way through the caverns to find the Fountain of Objects, restore it, and escape to the exit. The cavern is full of dangers. Bottomless pits and monsters lurk in the caverns, placed here by the Uncoded One to prevent you from restoring the Fountain of Objects and the land to its former glory.