Half-Life 2: Episode Three weapons run again thanks to a modder
A Danish modder got leaked Half-Life 2: Episode Three code running, showing a weapon that turns concrete and water into electric rain, plus a drone and exploding slugs.

Half-Life 2: Episode Three never came out, but you can now watch some of its weapons work. A Danish modder who goes by noahesbjerg has posted two videos of unreleased guns, a companion drone and a swarm of slugs, all running from Valve's leaked code.
According to noahesbjerg, he ported the leaked Episode Three code into the Source SDK editor (Valve's modding toolkit), fixed it up and dropped it into Half-Life 2: Episode Two. He made a few changes along the way, such as an ammo counter for the Weaponizer.
What is the Weaponizer in Episode Three?
The Weaponizer was meant to recycle things in the environment into projectiles. Metal mixed with fuel produced a fireball. Concrete mixed with water produced a "rain" of electrified particles, and so on.
The modder also showed the flechette gun, which fires Hunter projectiles, a gluon gun and a Gauss gun (both first seen in the original Half-Life), and a teleporting grenade launcher. None of these had their own models, so existing ones stand in.
Drone and slugs
The companion drone could be upgraded with better vision, a shield and a grenade launcher, and it could carry weapons. The slug chased the player and exploded on contact. It damaged enemies and could split into several smaller slugs.
The leaked code is separate from Valve's current secret project, codenamed hlx, which is believed to sit where Half-Life 3 would in the series timeline. So this is a look back at a cancelled game, not a hint about what comes next.
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