What is Half-Life 2 (includes Episode One and Episode Two)?

Half-Life 2 is a linear first-person shooter with light puzzle-solving elements and many setpieces, similar to its predecessor in concept. The player guides Gordon Freeman through City 17 and the wilderness that surrounds it. On his way, he'll encounter a few friendly characters, but also fight dangerous foes. The game features a realistic physics system: Gordon can pick up objects and toss them freely, and many of the puzzles are physics-based - for example, at one point the player has to weigh down a seesaw with bricks at one end to turn it into a ramp.

Gordon's enemies, apart from alien wildlife which found their way to Earth, are mainly Combine forces, which utilize a variety of firearms, gadgets, and vehicles. Policemen and foot soldiers work along with helicopters, gunships, and gigantic walking machines to hunt him down. To defend himself, Gordon has a range of weapons available: from the iconic crowbar for close-quarter fighting, through pistols and rifles, up to grenades and a rocket launcher. One of the most notable weapons is the gravity gun, with which Gordon can pick up objects, hold them in the gun's anti-gravity field, then hurl them at the enemy with great force.

Setpieces in the game include coordinated assaults on enemy bases, fighting gigantic boss enemies, bringing down aircraft with the rocket launcher, and others. A few levels require the player to navigate buggy-type vehicles. Some of the more exotic stages involve the player summoning an army of antlions to unleash on unsuspecting foes.

 - (MobyGames)

These are the native Mac Ports of the Half-Life game series done by Valve, ripped from the Steam resource files "hacked" and wrapped into a nice standalone Application bundle for your convenience.
Included are the original Half-Life 2, it's expansions Episode One and Episode Two as well as the Puzzle game Portal.
All chapters have been unlocked. ;)

Download Half-Life 2 (includes Episode One and Episode Two) for Mac

This software's download files include parts.
Learn how to combine file parts into a complete, usable, archive.

Architecture

Intel x86-64

System Requirements

From Mac OS 10.5 up to Mac OS 10.14

Compatibility notes

• OS: Leopard 10.5.8, Snow Leopard 10.6.3, or higher
• Memory: 1 GB RAM
• Graphics: Nvidia GeForce8 or higher, ATI X1600 or higher, Intel HD 3000 or higher

Emulating this? It could probably run under: QEMU