On level KV5 (of The Last Revelation) I realizaed I hadn't taken the jeep all the way through as you mention on your walkthrough.
The problem is, I reached that green entrance "building " after passing all the dunes and, since it's an upgoing (dark) ramp I can't go any further. It also seems to me that I can't go back to where I left the jeep (at the end of that up and down curbed course).
Is there a solution for this or must I begin the game all the way again?
Thanks for your help. Your site is amazingly well done !