Can't open the trunk?
You haven't a key, so use force.
Break the lock with the axe.
Can't find the Pyramid?
Go east and take a shovel with you.
East twice from southern Path and dig until you uncover it.
Can't get into the Pyramid?
There's a hole on top of it.
Put the stone cube in the opening.
Can't go north in the Chamber of Ra?
A rope could be useful.
Tie the rope to the Altar and throw the rope north.
Can't open the doors from the Circular Room?
Get the statue and its head. Roll statue NW, follow, drop head.
Return SE twice, door opens. Repeat for each exit.
Can't move the mast on the Barque?
Go to the Hold and examine the slot.
Remove the shim, drop it. Go back on deck, take beam (mast).
Can't open the panel in the Cube Room?
Move the bricks around.
Get and drop the 1st, 3rd and 5th brick.
Stuck at the bottom of the stairs?
A spot more digging is needed.
Dig the plaster with the pickaxe.
Killed in the room with two niches?
You need something to stand on.
Put beam in the niches, stand on it then dig the plaster.
What are the holes for in the Slab room?
Use the clusters.
Diamond: 1st hole, Ruby: 2nd, Emerald: 3rd, Opal: 4th.
What are the discs in the Treasury?
Scales. Use the gold and silver chalices.
Fill silver chalice with water to make it the same weight.
How do you move the statues in the Burial Room?
Put the book in the large recess and the scarab in the small one. 
Turn Neith, Selkis, Isis and Nepthys.