If you have the urge to try and get into the Half-Life franchise, I would say that Black Mesa is the best place to start. Extremely faithful re-imagining of the first game in one of my all time favorite Franchises. Excellent job by the devs for creating this project over the years. Very fun, and very immersive.

Intense game-play at times, but overall very enjoyable. I loved the story aspects and the in-game music.

legendary