The original Zombie Panic! arrives on Steam with various upgrades

The original classic survival-horror cooperative Half-Life 1 modification, Zombie Panic! has arrived on Steam with a number of upgrades. As long as you own the original Half-Life, you can play it for free.

From the steam page: "Zombie Panic! (ZP) was an old prototype cooperative survival-horror Half-Life 1 modification, first released back on Oct 31, 2004 via ModDB as a beta, and now re-released officially on Steam for free!

Following the classic human vs. zombie concept, the game pits a group of survivors against the walking dead. Your goal is to complete a number of objectives to reach safety, or take out the remaining zombies still lingering in the area. But those who were once your friends after death become the very same creatures you're trying to escape.

Ammo is a scarce resource, so don't run around guns blazing, or you'll run out of ammo fast and be easy prey. The more weapons and ammo you carry, the slower you move, so sharing what you don't need with your teammates increases your chance of survival."

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New for the Steam release:

• Half-Life's 25th anniversary support.
• Steam Achievements and Workshop.
• New fatigue system, replacing the 'jump delay'.
• New Zombie vision and ammobank HUD inventory.
• New first-person and third-peson animations.
• New player models and weapons.
• New mapping entities-tools.
• Updated User Interface.
• Updated classic maps visuals and gameplay.
• Rewritten source code using 'BugfixedHL' as a base.
• And much more!

Nice to see it now on Steam so it's easier than ever to get into! A fun bit of gaming history here. I remember playing hours of this back in the day.