Some of the people will greet you or glance at you going to work.Barney can be seen at the entrance of his checkpoint.Later in Anomalous Materials, one of the scientists would say 'Wasn't the tram ride a little longer, today?'.Half-Life's tram ride is estimated to be around 5 minutes, whilst Black Mesa's is estimated to be around 7 minutes, this gives the player a chance to look around inside the Black Mesa Research Facility.When the player dies, it will be a realistic firstperson-view death instead of instantly lying down.When the player dies, the NPC will react to Gordon's death similar to Half-Life 2.All weapons will have inspecting animation when acquired for the first time.The screen will flash green once something teleported.When hitting the vending machine, you can grab them, while in the original, you cannot grab the sodas. The vending machines give 15 cans of soda, while in the original, it only gave 10 cans soda.The G-Man appears more often in Black Mesa.A Half-Life walkthrough is estimated to be finished in 3 hours, whilst Black Mesa is estimated to be finished in around 6-8 hours.Half-Life is made from a modified Quake engine called GoldSrc, whilst Black Mesa is made with the Source Engine.Black Mesa doesn't have a training course, though some of the developers said it was cut for obvious reasons.

Black mesa research facility car decal