| Hint | Answer | % Correct | |
|---|---|---|---|
| C | Place of combine's administration on Earth | City 17 | 95%
|
| G | Mysterious man who oversees Gordon Freeman | G-Man | 90%
|
| W | Man who negotiated a peace agreement with the Combine, final boss of Half-Life 2 | Wallace Breen | 88%
|
| E | First human to make peaceful contact with Vortigaunts | Eli Vance | 85%
|
| B | Legendary ship that contains teleportation technology | Borealis | 83%
|
| X | Borderworld, discovered by Black Mesa, last retreat of Nihilanth's race | Xen | 79%
|
| Z | A Combine zombie (named by Alyx) | Zombine | 79%
|
| F | Guides Gordon through Ravenholm and arms him with a shotgun | Father Grigori | 78%
|
| P | Variant of a Headcrab which reduces player's health to 1 when hits | Poison Headcrab | 76%
|
| H | Combine Synth that injures Alyx early in HL2: Episode Two | Hunter | 73%
|
| N | Old prison transformed into facility used to process prisoners into Stalkers, Overwatch Soldiers, etc. | Nova Prospekt | 73%
|
| J | Black Mesa scientist who worked as double agent for Combine | Judith Mossman | 71%
|
| I | Black Mesa scientist who was on Breencast in HL2: Episode One | Isaac Kleiner | 68%
|
| R | Quantum event that started Black Mesa Incident | Resonance Cascade | 62%
|
| L | De-beaked domesticated Headcrab sent into space by accident | Lamarr | 60%
|
| D | Combine Synth used by the Combine to send units by air | Dropship | 58%
|
| A | Combine administrator | Advisor | 53%
|
| T | Location of final fight against Strider in HL2: Episode One | Technical Trainstation | 51%
|
| M | Weapon known also as Strider Buster | Magnusson Device | 45%
|
| S | Field imposed by the Combine to prevent human procreation, deactivated with near destruction of Citadel | Suppression Field | 38%
|
| O | Only enemy that will use Overwatch Standard Issue Pulse Rifle's Secondary Fire, they are highest ranking humanoid combine force | Overwatch Elite | 35%
|
| Q | Name of Chapter 12 of Half-Life | Questionable Ethics | 31%
|
| K | Barney Calhoun sends Gordon to that location early in HL2 | Kleiner's Lab | 30%
|
| U | Vortigaunt that helps Dr. Magnusson at White Forest | Uriah | 28%
|
| V | Location of Antlion nest at the start of HL2: Episode Two | Victory Mine | 13%
|
| Y | Transponders appear on the radar screen as this | Yellow Lambda Logo | 13%
|