I'm stuck in this cave with a blue ghost.

It's a friendly ghost - don't be afraid to approach it.

There's a door at the end of this upstairs hall that won't open.

You need to look elsewhere for the switch that will open it.

I've taken the elevator up, now how do I get out of this room?

Somebody has something to tell you first. Hit the speaker button on the wall. He'll let you out when he's done.

Where is the 'Main Laboratory'?

You're not far from where you can see it - find your new friend, the Mung first.

The Mung promised me a keycard, where is it?

It's in the wall inside his cell. Just press up against it for a minute or two.

There's millions of Troopers and Tanks here, how can I survive?

Take the empty tank, the one that is not firing at you.

What's a 'survivor of the Unholy Wars'?

You'll find out more about the Unholy Wrs later, just trust the Mung that survivors are something to be watched out for.

What are these mutant guys throwing at me?

Electroscism. Attack quickly, then retreat back into the hall if they're still alive - they won't follow you far in that direction.

I can't get across to the entrance to the subway - the lever won't work!

There's a part missing from the lever. One of the sewer dwellers took it, check everything. You'll be doing some wading, crawling, and even some leaping.

Is there anything behind the low grate?

Before you raise it, look up, and look before you leap.