Check the briefcases you get very good, you might find a button on it
or a lock! (When you have the hemostat go back tot the man in the
beginning, he'll give you a lock pick)

Security code in Palace is => At back of ID-CARD

Code of the computer in the room where you placed the Luger's is =>
1971

The number of the lab where the professor gets smashed to the window
is => 1126

The combination off the drawers in the save room are => Red, Green,
Blue and Brown.

The Painting's-puzzle must be solved in this order => 1st. The
woman, 2nd The man with the two child's, 3d The man with the scale,
4th The man with the golden cup, 5th The man with the vase with the
candles and 6th The man with the normal vase. Then walk to the boys
painting and click him!!!

The Oil puzzle solves like this:
2 times 3
1 time 5
1 time 10
2 times 3
1 time 5
this will bring the bridge down.

Also when you pick up a vase or a pot. check in it or at the bottom of
it, you might find anything in or on it!

And don't shoot at everything that moves! It's a waste of bullets.
When you think you're only going to a place for once, try not to shoot
or anything just walk by! Like the dogs you'll meet in the beginning,
just run by them! And the giant earthworm at the training facility.