| 1. | Half-Life - Chapter 0: Hazard Course | 58 | | Half-Life
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| 2. | Half-Life: Blue Shift - Chapter 0: Hazard Course | 38 | | Half-Life
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| 3. | Half-Life - Chapter 7: Power Up | 37 | | Half-Life
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| 4. | Half-Life - Chapter 18: Nihilanth | 36 | | Half-Life
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| 5. | Half-Life: Opposing Force - Chapter 1: Welcome to Black Mesa | 34 | | Half-Life
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| 6. | Half-Life: Opposing Force - Chapter 0: Boot Camp | 33 | | Half-Life
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| 7. | Half-Life: Opposing Force - Chapter 2: "We Are Pulling Out" | 31 | | Half-Life
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| 8. | Half-Life - Chapter 3: Unforeseen Consequences | 30 | | Half-Life
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| 9. | Half-Life - Chapter 15: Xen | 30 | | Half-Life
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| 10. | Half-Life: Blue Shift - Chapter 3: Duty Calls | 29 | | Half-Life
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| 11. | Half Life Opposing Force - Chapter 6: Crush Depth | 23 | | Half-Life
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| 12. | Half-Life: Opposing Force - Chapter 4: Friendly Fire | 22 | | Half-Life
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| 13. | Half-Life: Blue Shift - Chapter 1: Living Quarters Outbound | 20 | | Half-Life
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| 14. | Half-Life: Opposing Force - Chapter 3: Missing in Action | 20 | | Half-Life
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| 15. | Half-Life: Blue Shift - Chapter 2: Insecurity | 20 | | Half-Life
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| 16. | Half-Life - Chapter 2: Anomalous Materials | 19 | | Half-Life
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| 17. | Half-Life: Opposing Force - Chapter 9: Foxtrot Uniform | 18 | | Half-Life
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| 18. | Half-Life - Chapter 12: Surface Tension | 18 | | Half-Life
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| 19. | Half-Life - Chapter 17: Interloper | 16 | | Half-Life
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| 20. | Half-Life: Opposing Force - Chapter 11: Worlds Collide | 16 | | Half-Life
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| 21. | Half-Life: Blue Shift - Chapter 5: Focal Point | 16 | | Half-Life
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| 22. | Half-Life: Opposing Force - Chapter 5: We Are Not Alone | 14 | | Half-Life
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| 23. | Half-Life - Chapter 4: Office Complex | 14 | | Half-Life
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| 24. | Half-Life: Opposing Force - Chapter 7: Vicarious Reality | 14 | | Half-Life
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| 25. | Half-Life: Blue Shift - Chapter 6: Power Struggle | 13 | | Half-Life
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| 26. | Half-Life: Blue Shift - Chapter 7: A Leap of Faith | 13 | | Half-Life
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| 27. | Half-Life - Chapter 14: Lambda Core | 12 | | Half-Life
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| 28. | Half-Life - Chapter 13: "Forget About Freeman!" | 12 | | Half-Life
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| 29. | Half-Life - Chapter 5: "We've Got Hostiles" | 12 | | Half-Life
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| 30. | Half-Life: Blue Shift - Chapter 4: Captive Freight | 11 | | Half-Life
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| 31. | Half-Life: Opposing Force - Chapter 10: "The Package" | 11 | | Half-Life
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| 32. | Half-Life - Chapter 8: On a Rail | 9 | | Half-Life
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| 33. | Half-Life - Chapter 16: Gonarch's Lair | 9 | | Half-Life
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| 34. | Half-Life: Opposing Force - Chapter 8: Pit Worm's Nest | 9 | | Half-Life
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| 35. | Half-Life - Chapter 9: Apprehension | 8 | | Half-Life
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| 36. | Half-Life - Chapter 10: Residue Processing | 6 | | Half-Life
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| 37. | Half-Life - Chapter 11: Questionable Ethics | 6 | | Half-Life
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| 38. | Half-Life - Chapter 6: Blast Pit | 5 | | Half-Life
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