Realistic Gasses for Aground is a free mod designed for Windows that introduces a complex gas system to the popular game Aground. This mod serves as a foundation for future gas-based items, allowing players to interact with various gases in a more realistic manner. Players can now add helium sacs to their inventory, effectively decreasing their pack weight by 10 units for each sac added. This feature enhances gameplay by introducing strategic decisions regarding inventory management.

The mod includes several gases with unique atomic weights, such as Protium, Deuterium, Tritium, Tralphium, Helium, Oxygen, and Carbon Dioxide. Each gas has a specified relative weight, enriching the game's resource management aspect. The introduction of these gases opens up possibilities for future developments and modifications, making it a valuable addition for Aground enthusiasts looking for a more immersive experience.