Across
- 4. What Dr. Kleiner feeds his pet headcrab
- 5. Title of Half-Life's ninth chapter
- 8. University which Eli wears a shirt of
- 11. Large Race X creature that nests in dark sewer tunnels
- 14. Rebel who is shot during the fight at Shorepoint
- 16. Power company supplying blue chargers seen in the Opposing Force boot camp
- 19. Shephard's military rank
- 20. Gordon Freeman's alternate name in Epistle 3
- 23. Particle used by the weapon mounted on the scout car
- 24. Rebel Alyx speaks with through a laundry basement window
- 25. Name of the mine located near White Forest ([...] Mine)
- 26. Lone survivor encountered in the distillery in the Quarantine Zone
- 28. Acronym of the official name of the AR2 used by Combine soldiers
- 30. Cut enemy whose head can be found as an easter egg in Half-Life 2
- 32. Found on Dr. Kleiner's mini teleporter
- 33. Adjective used for the couple encountered sitting together throughout HL2 and episodes
- 35. The word written under graffiti of a hand with a lambda reaching up
- 39. Paint brand providing buckets of white paint
- 46. The finest mind of his generation
- 47. The name of Eli's late wife
- 48. Animal that acts as a secrete explosive weapon in Opposing Force
- 51. Flying Xen creature first seen during G-Man's speech in Half-Life 1
- 52. Electric bug used as a weapon by Shephard
- 53. Name of a conscript who gets shot by snipers
- 55. Despite the word appearing in its name, the cut enemy Mr. [...] very much wasn't that
- 56. Flower supposedly eaten by a character in a book Gordon is reading
- 57. Scientist hiding on top of the rocket testing silo power generator
- 61. Fill the gap: "Hey down there! [...] Look out below!"
- 63. Marc Laidlaw's account concerning Breen in his host body
- 65. One-eyed bug used as a weapon by Gordon Freeman
- 66. Cut NPC who was an engineer on the Borealis in the beta
- 68. Scientist who turned on the surgical unit and never made it back
- 71. Citizen met on the train in the vignette 'Now Arriving: City 17'
- 73. Title of Blue Shift's second chapter
- 75. Alternative name used for Civil Protection units
- 76. Rank of Alyx's father in the Half-Life 2 beta
- 77. The true enemy to humanity's evolution, according to Breen
- 80. Barney's last name
- 82. First word of the Half-Life: Alyx post-credits scene
- 85. Colonel Cubbage's first name
- 87. Oil company whose logo is seen on shipping containers throughout Half-Life 2
- 88. Alyx's voice actress in Half-Life 2
- 90. Cut Half-Life 2 'weapon' that allowed Gordon to (manually) throw objects at enemies
- 95. Father Grigori's gun
- 96. Griggs' companion
- 99. Name the Vortigaunts give Combine advisors
- 104. Tall, three-legged synth
- 105. The name first suggested for Gordon Freeman by Marc Laidlaw
- 107. Black Mesa East's string-based teleporter model
- 109. Name associated with the mysterious shadowy scientist seen near the Vault
- 110. Name of the drill instructor who guides Shephard through training
- 111. Title of the soundtrack that plays when putting on the HEV Suit in Half-Life 1
- 112. Rebel who operates the crane lifting the scout car
- 113. Voice actor of Father Grigori
- 114. Junction where Alyx attempts to rescue her father from a train
- 115. First words spoken by the Nihilanth upon Gordon's arrival in Xen
- 116. Weelchair-bound Black Mesa scientist (full name)
Down
- 1. Cut Half-Life 1 enemy with psionic powers
- 2. Pizza restaurant in the Black Mesa facility ([...]'s Pizza)
- 3. Title of the soundtrack that plays after the Shorepoint battle
- 6. Term used by Overwatch to refer to a thumper
- 7. Transparent, floating entity found in Xen
- 9. The Vortigaunts' equivalent of The Force
- 10. Scientist who assists Rosenberg with the teleportation sequence
- 12. Greek letter associated with the Half-Life series
- 13. Name of the gnome in Episode 2
- 15. Black Mesa employee whose locker contains a US flag and handgun ammo
- 17. Parasitic creatures that latches onto people's heads
- 18. Term used by Overwatch to refer to headcrab zombies
- 21. Large, armored Xen creature that can shoot jets of fire
- 22. The word written next to an image of a CP/Combine holding a baby (we still don't know why)
- 23. Hotel outside the City 17 train station ([...] Hotel)
- 27. Rebel outpost commanded by Colonel Cubbage
- 29. Shark-like Xenian creature
- 31. Eli's last name in the Half-Life 2 beta
- 34. Final boss of Opposing Force
- 36. Creature that took Eli's leg
- 37. Dr. Breen's first name
- 38. Full name of the beige-suited player character in Decay
- 40. Brain-damaged Vortigaunt
- 41. Term used by the Combine for wanted individuals
- 42. Method used by the Resistance for teleportation (also a chapter title)
- 43. Name used for the Combine trains ([...] train)
- 44. Name associated with the 'bespectacled scientist' model
- 45. Name of the forklift driver
- 49. The greatest endeavour, according to Breen
- 50. Cut weapon which consists of a grenade that shoots out tripwires in all directions
- 54. Pack creature enemy that was originally intended to be friendly
- 58. Mossman's first name in the Half-Life 2 beta
- 59. One of Shephard's bunkmates is from this place
- 60. Name associated with the 'fat security guard' model
- 62. Number of hours it took the Combine to take over Earth
- 64. Lost ship with the ability to teleport
- 67. Device used to conduct the disastrous anomalous materials test
- 69. Full name of the red-suited player character in Decay
- 70. Magazine which once featured a young Dr. Kleiner on its front page
- 72. Name given to antlion guards by Vortigaunts
- 74. Nickname of Gordon's original 'space biker' model
- 76. Large Combine tower at the center of City 17
- 77. Freeman's experience at this institute got him his job over Dr. Mossman
- 78. Dr. Magnusson's first name
- 79. Name of the rebel who gives you the airboat
- 81. Logo seen on the wall of Dr. Kleiner's lab behind some equipment
- 83. Voice actor of Dr. Breen
- 84. Dr. Breen's title during Half-Life 2's beta development
- 86. Large hotel in the Quarantine Zone
- 89. Combine device which malfunctions and supercharges the gravity gun
- 91. Combine device used as a ball by Dog
- 92. Cut underwater research base of the Resistance
- 93. A massive, star-encompassing structure glimpsed at the end of Epistle 3
- 94. Purple, one-eyed creature found in a locker in Blue Shift
- 97. Organic weapon used by Alien Grunts
- 98. Kleiner's pet headcrab
- 100. Military unit to which Shephard belongs
- 101. The highest known rank in the Combine hierarchy
- 102. Dr. Kleiner's first name
- 103. What Griggs tells Gordon to be
- 106. Headcrab zombie that has mutated to a more advanced stage
- 108. Particle used by the last weapon obtained in Half-Life 1
