Thanks, I finished the game!
Ok.....now I get to generate a walkthrough:
Interact with car.
Open the glove box at the right.
Try to make out three objects in the glove box and interact with them.
Press 'EXIT' found at the very right.
Interact with your wallet found in your inventory (if you can't see it, look harder).
Walk to the very right.
Use your wallet on the tramp's head.
Ask about your daughter.
Tell him that he is arrested.
Ask him if he knows the terrorist's name.
Interact with the door labeled '6' on the top.
On the front wall, there is a little gray bell next to a door.
Interact with it.
Use your wallet on the person inside known as "the caretaker".
Ask about Hassem.
Walk out the room.
Walk back in the room.
You discover he is in the league of the terrorists.
Use your gun on him.
Now talk to him.
Use your handcuffs on him.
Get the 'stick' at the right. (It's actually a broken broomstick.)
Now walk out the room again.
Press the red button near the lift found at the left wall.
Walk in the lift.
There is a circle at the top. (It's a manhole, by the way.)
Use your 'stick' with it.
Use your 'stick' with it again.
Now interact with the brown spot in the circle.
Wait.
Walk through the opening at the right.
Walk to the end of the second manhole so that the terrorist guarding the 7th floor comes.
You have to hurry.
Use the 'walk' cursor on the black part of the first pillar (which is near the entrance of the maintainance corridor).
Wait a little.
Use your gun on the terrorist that just walk past you.
Now interact with his dead body so that you find a knife.
Walk back to the top of the lift.
Interact with the black part of the circle.
Now, walk out.
Use your gun on the first door (near the lift).
Now you have to really hurry.
Shoot the second terrorist before he makes it to the door.
Interact with him to find a piece of paper.
Go to the room the terrorist was going to.
There your find your daughter.
Ok, here is the tricky part, click on the knife in your inventory.
You see the white pixel on it?
Use the white pixel on the knife right on the tape on your daughter.
She tells your that there is a bomb in this flat.
It is in the waste basket right below the desktop.
Go back out the room.
Interact with the wastebasket.
Ok, copy the number down on a piece of paper. (Real life, I mean)
Interact with the bomb on the floor.
Ok, the buttons go in the following order (Numbers you are supposed to press are red):
1,2,3,4,5
6,7,8,9,0 A
The numbers have to go in the following order:
07462A
Watch scenes at the back.
Enjoy!

WALKTHROUGH:
Interact with car.
Open the glove box at the right.
Try to make out three objects in the glove box and interact with them.
Press 'EXIT' found at the very right.
Interact with your wallet found in your inventory (if you can't see it, look harder).
Walk to the very right.
Use your wallet on the tramp's head.
Ask about your daughter.
Tell him that he is arrested.
Ask him if he knows the terrorist's name.
Interact with the door labeled '6' on the top.
On the front wall, there is a little gray bell next to a door.
Interact with it.
Use your wallet on the person inside known as "the caretaker".
Ask about Hassem.
Walk out the room.
Walk back in the room.
You discover he is in the league of the terrorists.
Use your gun on him.
Now talk to him.
Use your handcuffs on him.
Get the 'stick' at the right. (It's actually a broken broomstick.)
Now walk out the room again.
Press the red button near the lift found at the left wall.
Walk in the lift.
There is a circle at the top. (It's a manhole, by the way.)
Use your 'stick' with it.
Use your 'stick' with it again.
Now interact with the brown spot in the circle.
Wait.
Walk through the opening at the right.
Walk to the end of the second manhole so that the terrorist guarding the 7th floor comes.
You have to hurry.
Use the 'walk' cursor on the black part of the first pillar (which is near the entrance of the maintainance corridor).
Wait a little.
Use your gun on the terrorist that just walk past you.
Now interact with his dead body so that you find a knife.
Walk back to the top of the lift.
Interact with the black part of the circle.
Now, walk out.
Use your gun on the first door (near the lift).
Now you have to really hurry.
Shoot the second terrorist before he makes it to the door.
Interact with him to find a piece of paper.
Go to the room the terrorist was going to.
There your find your daughter.
Ok, here is the tricky part, click on the knife in your inventory.
You see the white pixel on it?
Use the white pixel on the knife right on the tape on your daughter.
She tells your that there is a bomb in this flat.
It is in the waste basket right below the desktop.
Go back out the room.
Interact with the wastebasket.
Ok, copy the number down on a piece of paper. (Real life, I mean)
Interact with the bomb on the floor.
Ok, the buttons go in the following order (Numbers you are supposed to press are red):
1,2,3,4,5
6,7,8,9,0 A
The numbers have to go in the following order:
07462A
Watch scenes at the back.
Enjoy!