1. Your objective is to get inside that lighthouse. Pick up the large medkit directly ahead.

2. Snipe these enemies as you walk around the lighthouse.

3. More enemies are on the cranes.

4. This makes a good sniping platform to clear the area below before descending the stairs.

5. Enter the building through this door.

6. Fight three gunmen inside. If you want to see everything, descend those stairs. Everyone else can skip ahead.

7. A single enemy is at the bottom of the stairs, then these two through this door.

8. Continue through the door on the right, then through this door.

9. In addition to two enemies, this room holds armor, a large medkit and ammo.

10. Backtrack upstairs and proceed through that door straight ahead.

11. Defeat the men inside then continue through that hole in the wall.

12. Hit them with your boomer before they hit you with theirs. Grab the armor under the crates before climbing to the rooftop above.

13. There are enemies on the catwalks above, and a medium medkit down the ladder ahead.

14. Time for a fierce gun battle. This would be a good time for adrenaline mode. Make your way around the left side of that building.

15. Enter through that opening. The ladder visible inside leads to the roof where you will find the short way -- you folks can jump ahead. Everyone taking the long way, continue through the hole in the wall next to the ladder.

16. Pass through the door on the right to this firefight.

17. Continue through the door seen here on the left. Defeat the lone gunman inside.

18. Fight your way through this door, grabbing the ammo from under the stairs before heading up.

19. Grab the armor under these stairs before ascending further.

20. Proceed through this door.

21. Blast past these three to the door seen far-right.

22. Drop the guard and grab the armor.

23. Descend these stairs.

24. And these. Exit to the right.

25. You'll find ammo to the right of those valves.

26. Pass through the door directly behind this guy.

27. Take down this guy, plus another on the right, where you'll find a medium medkit.

28. Climb this ladder.

29. Defeat the guards in here, as well as those on the catwalks above.

30. Climb this ladder.

31. Go through this door.

32. If you've taken the short way you can climb the roof then jump to this catwalk as indicated.

33. You'll find a small medkit as you follow the catwalk to this door. Jump across to the ladder ahead.

34. Grab the armor seen far-left before dropping through the indicated opening.

35. Climb into this tunnel, taking the first left.

36. Drop through this opening.

37. Take out the guards in the corridor.

38. Explore the various rooms for health, armor and ammo, but this is the room you need to advance. Shoot out the grate as seen here and climb in.

39. Ascend this long ventilation shaft.

40. Shoot out the grate at the top to enter this room, where you'll find heavy resistance.

41. Avoid the stairs. Instead, climb this ladder to the catwalk above. Pass through the door next to the ladder.

42. Time for adrenaline mode. You'll find guards just inside this door and on the catwalks above.

43. Climb the ladders to the top level.

44. To your left is this door, behind which you'll find armor and a grenade.

45. After returning, this guard has spawned. Defeat him then continue through the door ahead.

46. Fight your way to the door at the top of these spiral stairs.

47. Snare this large medkit next to these valves.

48. Activate this lever.

49. You've attracted an audience outside the door -- time to use the grenade you picked up earlier.

50. Fight your way down the spiral stairs.

51. At the bottom of the stairs is this elevator. Approach and the doors open. Enter to end the level.