Half-Life 2 Walkthrough — Start to Endgame

Half-Life 2 is Valve's legendary FPS that redefined the genre through physics-based gameplay, environmental storytelling, and the Gravity Gun. Playing as Gordon Freeman in the dystopian City 17 under the Combine's alien occupation, you fight through varied environments using creative physics interactions alongside traditional gunplay. The Gravity Gun transforms every object into a weapon — sawblades, radiators, and explosive barrels become your arsenal. Twenty years after release, HL2's pacing, level design, and moment-to-moment gameplay remain a masterclass. The Episodes (1 and 2) continue the story with refined gameplay and one of gaming's most memorable endings.

This walkthrough takes you from your first session to endgame content. Each phase has specific goals, priorities, and milestones. Follow this path to avoid common traps that stall most players.

Quick Progression Summary

Phase 1: Getting Started — City 17

The opening area and endgame location. The oppressive Combine-controlled city establishes the tone and introduces core mechanics. The Civil Protection chase through apartments teaches movement and basic combat. Returns for the final battle.

Level/Difficulty: Chapter 1 / Final chapters Key Rewards: Introduction to all mechanics, crowbar, pistol, story setup

What to Do in City 17

1. Learn gravity gun physics. The Gravity Gun lets you pick up and launch any physics object. Spend your first session getting comfortable with this.
2. Pick Physics Master as your starting role. It's the most forgiving option.
3. Sawblades launched with the Gravity Gun are the best weapon in Ravenholm. They slice through multiple zombies and can be retrieved from walls. Always carry a sawblade.
4. Acquire your first weapons upgrade — Crossbow or whatever's available.
5. Clear all main content before moving on.

Phase 1 Checklist

• Understand gravity gun physics fundamentals
• Physics Master selected and functional
• City 17 main content cleared
• Ready for Ravenholm

Phase 2: Early Game — Ravenholm

The horror chapter with headcrab zombies and the Gravity Gun as your primary weapon. Father Grigori guides you through with a shotgun and iconic one-liners. Sawblades and traps are scattered everywhere for physics kills. 'We don't go to Ravenholm.'

Level/Difficulty: Chapter 6 Key Rewards: Shotgun, physics combat mastery, horror experience, sawblade kills

What to Do in Ravenholm

1. Work on vehicle sequences. Extended driving sections with the airboat (canals) and muscle car (Highway 17) break up combat pacing. This system becomes critical from here on.
2. Farm for Crossbow if you haven't already. It's the key upgrade for this phase.
3. The crossbow's heated rebar bolts pin enemies to walls. Headshots on Combine soldiers are always one-shot kills. Retrieve bolts by walking over fallen enemies.
4. Complete all objectives before pushing to Highway 17.
5. Consider whether Run and Gun might suit your playstyle better than Physics Master.

Phase 2 Checklist

• vehicle sequences integrated into gameplay
• Crossbow acquired
• Ravenholm fully cleared
• Ready for Highway 17

Phase 3: Mid Game — Highway 17

The coastal driving chapter with the muscle car and mounted tau cannon. Features the bridge sequence, antlion encounters, and lighthouse defense. Long but varied chapter with vehicle and on-foot sections.

Level/Difficulty: Chapter 8 Key Rewards: Vehicle combat, antlion encounters, coastal scenery, tau cannon

What to Do in Highway 17

1. Master squad commands. In later chapters, friendly rebels join you and can be commanded with simple point-and-click orders. This unlocks a new layer of gameplay.
2. Start working toward Gravity Gun. It's the best weapon and becomes accessible around now.
3. Break every crate and box you see with the crowbar. Supply crates contain ammo, health, and suit energy. Lambda symbols (λ) painted on walls indicate hidden supply caches nearby.
4. This area is the main skill check. If you can clear it, you're ready for late game.
5. Start investing in environmental puzzles for the tactical depth you'll need going forward.

Phase 3 Checklist

• squad commands mastered
• Gravity Gun acquired or in progress
• Highway 17 fully cleared
• Ready for Nova Prospekt

Phase 4: Late Game — Nova Prospekt

A Combine prison facility with intense squad-based combat. The turret placement mechanic lets you set up defenses at choke points. The emotional turning point of the story occurs here.

Level/Difficulty: Chapter 9-10 Key Rewards: Turret placement, squad combat, story climax, pulse rifle

What to Do in Nova Prospekt

1. Finalize your build. You should be running Run and Gun or Physics Master with optimized gear.
2. Gravity Gun should be your primary. If you don't have it yet, prioritize getting it.
3. The pulse rifle's alt-fire energy ball bounces off walls and disintegrates any enemy it touches. Bounce it around corners to clear rooms without exposing yourself.
4. narrative exploration optimization starts here. Small improvements compound into massive advantages.
5. Farm this area for the resources needed to push into The Citadel.

Phase 4 Checklist

• Build fully optimized
• Gravity Gun upgraded to max
• Nova Prospekt fully cleared
• Ready for The Citadel

Phase 5: Endgame — The Citadel

The final chapter inside the Combine's towering fortress. The Super Gravity Gun replaces all weapons, letting you rip apart Combine soldiers and technology. The most empowering gameplay in the entire game.

Level/Difficulty: Chapter 14 (Final) Key Rewards: Super Gravity Gun, story resolution, endgame spectacle

What to Do in The Citadel

1. The Citadel tests everything. Come prepared with your best build and gear.
2. Gunships require guided RPG rockets to destroy. Fire the rocket and guide it with your laser — the Gunship will try to shoot the rocket down, so weave it through cover.
3. The endgame loop: run The Citadel, optimize gear, push harder content.
4. Experiment with Speedrunner for a fresh take once you've mastered the standard builds.
5. This is where narrative exploration mastery separates good players from great ones.

Phase 5 Checklist

• Endgame content on farm
• Best-in-slot gear acquired
• The Citadel fully cleared
• Ready for challenge content

Common Progression Mistakes

• Hoarding ammo and never using it. Half-Life 2 provides enough ammo for sustained combat — using your full arsenal makes every fight easier and more fun.
• Ignoring the Gravity Gun after getting better weapons. The Gravity Gun remains the best weapon throughout the game because physics kills don't cost ammo and are often one-shot kills.
• Trying to fight Gunships with regular weapons. Gunships are nearly immune to bullets — you must use the guided RPG. The game always provides RPG ammo near Gunship encounters.
• Running past supply crates without breaking them. Crates are the primary source of health kits and ammo. Breaking every crate ensures you're always well-supplied.
• Not using the turret placement mechanic in Nova Prospekt. Turrets provide enormous DPS at choke points. Place them facing enemy spawn doors and let them do the work.

Key Tips for Smooth Progression

1. Sawblades launched with the Gravity Gun are the best weapon in Ravenholm. They slice through multiple zombies and can be retrieved from walls. Always carry a sawblade.
2. The crossbow's heated rebar bolts pin enemies to walls. Headshots on Combine soldiers are always one-shot kills. Retrieve bolts by walking over fallen enemies.
3. Break every crate and box you see with the crowbar. Supply crates contain ammo, health, and suit energy. Lambda symbols (λ) painted on walls indicate hidden supply caches nearby.
4. The pulse rifle's alt-fire energy ball bounces off walls and disintegrates any enemy it touches. Bounce it around corners to clear rooms without exposing yourself.
5. Gunships require guided RPG rockets to destroy. Fire the rocket and guide it with your laser — the Gunship will try to shoot the rocket down, so weave it through cover.

For detailed build optimization, see Half-Life 2 builds. For quick wins, check tips & tricks.