In Fallout Online, players would have engaged in a blend of strategic gameplay and role-playing elements, allowing for character customization and exploration of the post-apocalyptic world. The game aimed to incorporate both cooperative and competitive gameplay mechanics, enabling players to form alliances or engage in conflicts.

The storyline of Fallout Online was expected to expand upon the rich lore of the Fallout series, immersing players in a narrative filled with factions, survival, and the consequences of nuclear war.

Fallout Online stood out with its ambition to create a living, breathing world where players could interact with each other and the environment in a dynamic way, although it ultimately never came to fruition.