I am at entry of big cavern which appears to look on the map as that is the next area I have to go into. Unfortunately, it doesn't seem to allow jumping onto whatever ledge it appears to show below etc. and I see no other options. I have tried several different things but apparently I can't figure this one out. If someone could shed some light on my problem, I would appreciate it very much. Thank you.

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It's not how you win the game, it's how you play it :-)

hi paddywag, I got stuck the same place....just put the jeep in overdrive (shift + up arrow ) and head down the curved road....good luck...you won't beleive what is after that!!.....lol
Paul