Is "I Am Legend" a Game? No, But Licensed Adaptations Exist

"I Am Legend" is a novel (1954, Richard Matheson) and film (2007, Will Smith)—not a game originally. However, it has official game adaptations:

• I Am Legend (2007) — Xbox 360, PS3, PC. Third-person shooter tie-in to the film. Mixed reviews.
• I Am Legend (2011) — Mobile (iOS/Android). Different game, also tie-in.

Games with Similar Themes (Viral Apocalypse, Solo Survival)

• The Last of Us — Fungal pandemic, emotional narrative.
• Days Gone — Open-world biker, freaker hordes, dynamic world.
• State of Decay 2 — Community survival, base building, permadeath.
• Project Zomboid — Deep isometric survival, "this is how you died."
• Resident Evil Series — Viral outbreaks, horror/action.

So while the IP isn't a game originally, licensed games exist. For the experience, the film/novel remain definitive.