“Rise of the Tomb Raider: 20 Year Celebration” is a special edition of the popular action-adventure video game “Rise of the Tomb Raider.” It was released in 2016 to commemorate the 20th anniversary of the Tomb Raider franchise, which debuted in 1996.

The 20 Year Celebration edition includes the base game, all previously released DLC (downloadable content), as well as new content and enhancements. Some of the notable additions in this edition include:

1. “Blood Ties” DLC: This story-based expansion allows players to explore Croft Manor, Lara’s childhood home, and uncover family secrets.

2. “Lara’s Nightmare” DLC: A horror-themed mode where players must defend Croft Manor against waves of undead enemies.

3. Co-op Endurance Mode: A multiplayer mode where players can team up with a friend to survive harsh conditions and hostile enemies.

4. “Extreme Survivor” Difficulty: A challenging difficulty mode for players seeking a greater level of difficulty and realism.

5. “Cold Darkness Awakened” DLC: A new story mission where Lara must stop a deadly viral outbreak in Siberia.

6. New Outfits and Weapons: The 20 Year Celebration edition includes additional outfits and weapons for Lara Croft, allowing players to customize their gameplay experience.

Overall, “Rise of the Tomb Raider: 20 Year Celebration” offers a comprehensive package for fans of the Tomb Raider series, providing an enhanced version of the base game along with additional content and improvements.