A mod where you won't be running around with weapons, because there simply aren't any. Instead of weapons you have snowballs, which a player can make if there's snow nearby. Snowballs take a while to fly, so hitting a player isn't that easy. The game has several modes.
Installation:
Copy the contents into the root Half-Life directory and launch the game with the following parameters
hl.exe -game snowIf you have Steam, Half-Life is usually located in C:/Steam/SteamApps/common/Half-Life or C:/Steam/SteamApps//half-life
Once you've copied the files, restart Steam and the game will appear in the list.
Screenshots:
Links: