How do I unlock the chest?
There's a key hidden close by.
Examine the statue.
Where is there a light source?
Find the safe in the kitchen. 
Examine the side of the far left hand unit.
I can't unlock the safe.
Open the bedside table in the scientist's room.
Operate the paper you find there on the safe.
The lighter doesn't last long enough!
Have a look in the chapel.
Search the mantlepiece in there for a candle.
I can't find the time machine.
Put the sphere on the column in the hall.
Push the switch on the wall in the workshop.
I get electrocuted as I go through the secret passage!
Put things back as they were.
Remove the sphere again before going through the passage.
Need a light in the prehistoric era?
Search by the river and the burnt-out fire.
Use the grass on the fire to light the wood.
Arggh! I've got leprosy!
Prevention is easier than cure.
Use the gloves when you shake the leper's hand.
I can't enter the pyramid safely.
A mystic might know something about it.
You must read and carry the fakir's scroll from India.
I can't get rid of the snakes.
Before entering the pyramid, examine the bush by the door.
Drop the amulet by the snakes.
How do I open the sarcophagus?
Examine the wall for a clue for how to move the levers.
You must move 4 levers, numbers two, three, four and five.
I can't get out of the pyramid again.
You will have to find a back way out.
Turn the right hand torch by the statue of Nephertiti.
What does the Mayan warrior want?
Examine the tree stump.
Operate the necklace on him.
I'm at the temple but nothing is happening.
Did you examine the cave paintings in the prehistoric era?
You must be at the temple by 13.00 hours.    
The railings fall and kill me.
Use something to stop them falling.
Put the bone in the left hole.
I can't deal with the first guard in the future section.
Have you got the stone from the burnt-out fire?
Operate it on his head.
I don't know what to do at the strange machine.
Open the top left box on it to see fuses.
Use the gloves to remove them.
How do I find and capture Richard?     
Use the strange key to open the door.
He'll give himself up if you're carrying his picture.