Ah, another hill climb enthusiast! <*waves*> As far as I know,
there's no sim out there that will do hill climbs per se, and there
isn't a rally sim with a good enough track editor to create one. I
really, *really* wish that it were otherwise, as I'd love to drive a
GPL car up Prescott or Loton Park.
*However*, all is not lost. GPL is, thanks to years of slogging away
by many, many utterly wonderful people, about the easiest sim to do
tracks for - if you look at the following link you'll find well over
200 of them:
http://magnust.d2g.com
Now, the main problem you have to find a way around is that GPL
requires a track to be a circuit, so if you do a hillclimb you'll
have to add a "return road" to allow things to join up. Careful
course design can make this quite transparent (have a look at the
"Rally" courses designed by "madcowie" for some good examples), but
you'll have to compromise somewhere.
Probably the best example of a hillclimb course for GPL is one done
for this year's Goodwood Festival of Speed, but sadly the licence
conditions of that mean that it can't be made publicly available -
however, you can see some fine screenshots via the link above. I
suggest you might get some more knowledgeable answers on this sort of
thing on the Track Creation Forum at Racesim Central:
http://forum.racesimcentral.com
Good luck! :-)
--
1) The GPL Scrapyard: http://www.btinternet.com/~gplscrapyard
2a) Bits'n'Bob-stones: http://www.geocities.com/daveb75
2b) See also: http://groups.yahoo.com/group/watershipdown
2c) Associated blog: http://frith.blogspot.com [Ta-da! 4-line sig!]