Picking up ammunition for the pistol or the shotgun grants the player 30 extra rounds instead of 17 and 12 respectively.The shotgun does not get 4 extra shells in reserve when picking it up.Neither the pistol nor the MP5 reloads automatically after emptying a magazine.The MP5 already has 50 loaded rounds when picked up.The Glock 17 doesn't have a reload sound.The Glock 17 has a higher resolution than the retail one's Glock 17.There is no secondary attack for the pistol it can only fire in semi-automatic mode.The Glock 17 pistol can have an additional round in the chamber after reloading a non-empty magazine, increasing the capacity to 18 rounds.pak files have priority over the files placed in the actual folders. Direct3D is not supported (only supports Software mode and OpenGL).The console and cheats cannot be directly activated, however, there are tricks which can enable it (found in the Trivia section).The demo does have some minor differences from the retail version of Half-Life.
The levels accessed in this demo are more or less identical to those that appear in the full game. Day One begins at the same point as the full game, but ends after the player completes the chapter 'We've Got Hostiles', at the end of the first day of the game's plot.
