Turn up your gamma.

Dig around in the graveyard; who knows what you'll
find?

Bring inventory items to the characters you meet for
clues on how to use them.

The thing that looks like an ancient nine-volt battery
is actually a cigarette lighter.

Don't assume you're done with a key unless it actually
disappears after you use it.

Can't reach something? Maybe the dead can lend you a hand.