E2M1 - The Installation
First impression of this level when you graduate from the Shareware version, and get the full version? "Why did I waste my money". These days, however, you can get Quake at a very modest £9.99 so it isn't a dent in your bank account. However with getting used to it, the level isn't so bad!
Secret 1
From the start of the level you go down a little corridor and into a room, ignore any exits except for the room you can see with water in it.
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You jump to the left, and under the wall, which you can see has the red dot in it. You need to go under the structure (in the corner) and up. There should be some armour in there. On the way there you may notice a small tunnel in the side, follow this to get some nails and go further and you will be teleported to the upper pathway, where you can obtain the rocket launcher.
Secret 2
Carry on the path you were on until you come to the yellow key room. When you arrive you will notice one side has a flashing yellow light, here is the second secret
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You will notice some shoddily made 'steps' in which you need to use to get to the little shelf at the top. The entrance is not exactly clear, and you can't shoot it to open it. It is what I call a 'ghost' door, in which it looks solid to look at but you can move through it. Here you will find a 100 health box. (I have noticed in online playing that it is rarely used.)
Secret 3
In the same room as secret 2, and facing the direction of the entry into the room, you will notice a pool. (It is just out of shot in the above photo)
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Jump into this pool and you will notice two little tunnels, take either one of them and at the end of them will be some ammo, armour and health.
Secret 4 and 5
As you explore around you will notice that the room with the gold key door looks onto a pool. This secret evaded me until I watched someone go into it, and for good reason. In this level the pentagram is around.
Jump into the pool and turn right. You will notice that a grate in the floor, surrounded by some 'pillars', like this:
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I would suggest going for air, then you will follow the tube down. Before you go all the way through you will stop at the bottom of the vertical bit, to shoot the grating at the side of the tube.
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I have found that this grating needs to be shot 3 times for the second secret to be revealed, which is a room with a pentagram in it. Once you have shot the grating 3 times follow the green line with speed to obtain environmental suit, before you drown.
When you reach the end of this tunnel you will see a pentagram in the second room and you will have health, and grenade launcher.
Secret 6
Just before you reach the silver door you will have to traverse three sets of lifts, which goes around a room which has crossing metal bars. At the first lift, don't go up it, run across it (get the shells) and then shoot the wall to your left. A quad will be revealed.
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Secret 7
At the top of this lift system, you will see that one of the crisscrossing bars is big enough for you to fit through, jump into it and find your way down, to get your armour.
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There are no other secrets on this level