They use detailed settings. For example, in 'Mass Effect', they describe different planets, species, and cultures in great detail. This makes players feel like they are really in that galaxy. Also, good storylines are key. A complex plot with twists and turns, like in 'Star Wars: Knights of the Old Republic', keeps players engaged. And the ability to interact with non - player characters (NPCs) in different ways adds to the immersion.
In many science - fiction role - playing games, the lore is very important. Take 'Deus Ex' for instance. The backstory about the world, the technology, and the power struggles create a rich tapestry that players can get lost in. Character progression systems also contribute. When you can upgrade your character's skills and abilities as in 'Warframe', it gives you a sense of growth within the world. And the side quests and mini - stories, like those in 'System Shock 2', add layers of depth to the overall immersive experience.