Map 1

On spawn, look down and left. There are a couple of cracks in the wall. Hit with crowbar. Move through and use crate/drum to jump into vent.
Halfway through vent, pause and shoot plank crossing door through grill. Drop out of vent and go through door and then through door to left and then one opposite
Run round the fence in the yard and enter dark building. Turn right and break through planks with crowbar. Go in and up ladder, then drop off open end into yard
Go through the gate and enter the garage. Follow the wall right until you reach a door. Go through and there are various workbenches. The right corner by the wheels has a connector you will need (Message appears when you find it).
In the far right corner of the main garage are stairs. Go up, kill the zombies (SAN) and use the fizzing box at the far end to fix the gate.
Go to the gate with the fizzing panel, open and enter yard. Enter the stables (Ghost pops and goes. SAN). Kill/avoid zombies.
Go through the door to the far right of the main stable door and through second door.
Kill headcrabs in here and jump on boxes (starting near little cubby area) and over the wall.
Go through the door, down the passage and through the only other door that opens.
In this room is another cracked bit of wall. Smash this and crawl through (Headcrab). Go through door and down corridor to zone.

Map 2

On spawn move forward and through into garden. Go straight through to next gate. Ghost by fountain will vanish with scream (SAN). Kill fast zombies, fast headcrabs and the poison zombie in this garden area.
Enter hedge maze and follow right wall until you reach the hut. Go in and drop through floor in far left corner. Follow tunnel to zone.

Map 3

On spawn follow tunnel to end and bash in with crowbar. Drop down and go through double doors into the chapel.
Wait for a while and fast zombies break in and attack. Kill them all and after another long delay the door at the far left end will open.
Bash in grate, follow tunnel killing the headcrabs as you go. Down a side tunnel you will see a firebarrel. Shoot it.
Go to end of crawlway and bash way out and go through door and round partition.
Approach door and kill FZs that crash through. Enter that room and out next door. Turn right and go through door with sparking wire.
Up stairs and through door (kill Z) and up more stairs to zone.

Map 4

On spawn go through door and clear kitchen of zombies. Enter door mid way down right wall and go down corridor.
Through door at the end and through door on right. You will find a key on the table for the locked door in the kitchen.
Go back to kitchen and take the other door in the wall where you first entered.
Move into dining room and all hell breaks loose (SAN). Kill everything to zone.

Map 5

On spawn you can now leave via double doors into main house lobby. Go upstairs and turn right. Follow landing around until you get to third door in wall opposite the double doors you entered by.
Go through, kill Zs and pick up key on table. Go to diagonally opposite door on landing and enter the library.
On reading desks, use the book in the far left corner to find a key. Go back to landing and head UP the stairs there. Kill PZ.
Go through the door on the right at top of stairs and through the next one. Part way down room, FZs attack, Kill them and go through next door.
Follow corridor round to the end, turn right and enter that door. Kill PZ and go through following door.
Listen to idiot's rambling. Follow his advice and return to the main lobby. There is a door under stairs here. Go through, kill PZ and then through door at end of corridor to zone.

Map 6

Enter into well lit ballroom and then immediately retreat back under stairs (SAN). A Crystal Travller (i.e. Vortigaunt) will spawn and attack if it spots you. Kneel down and look round the wall at the chandelier. Shoot each of the crystal globes to destroy them (including one in centre) and vanquish the V. Go to right corner by statues and USE on wall to open secret door. Go in and up stairs to top. Destroy FZs that come up after you. Click on telescope on platform to get code for door. Go back down and kill FZ by keypad. Click on buttons to open door (you will hear a suitable clunk). Keypad goes 1 – 2 – 3 then 4 – 5 – 6, etc. Go down steps to zone.

Map 7

Open door on spawn to enter corridor. Move along and down stairs (kill HCs) and through door at bottom then door on left. Out door at end and turn left and follow corridor round (Kill Zs and FZs) until you come to a door on the right. Enter here (Kill PZ) and then through door directly opposite. There is a key on the table here to pick up. Return the way you came to the top of the stairs and take the door (Kill Zs). Take door on left and the one at the end of the corridor into lab. Go out other door (Kill FZs) and follow corridor and go down stairs. Go through door, through office, through other door, through door at end of corridor and turn right down stairs. In flame torch area open double doors (SAN) and click on platform/corpse to get another key. Kill FHCs. Go back upstairs and through door there. Go through double doors into power core area.

Now you have the big fight. After the first button is pushed 2 constantly regenerating Man Hacks will spawn and generally make your life very difficult. Also after each button push a squad of YithTech-enhanced Humans (i.e. Combine) will come in and try and kill you. Kill each wave as it appears. The buttons to press (in order) are located:
In from bridge and on left, opposite side to bridge, on the promontory, down on the lower level (right side) and then lastly on main core column (off bridge and slightly left). Once the last button has been pressed the core will swiftly overload (place shakes and explosions start going off). Immediately leg it back the way you originally came to get out before it all blows. Watch end sequence after note.