Extreme?
http://www.pelpo.net/maps/show_map.php?user=Aslak&...
Doesn't look that bad, but the map was one big boulder field.
O-M Taivainen ran it in 44, which seems incredible. And as for me:
http://suunta2000.sporttisaitti.com/@Bin/3885520/K...
I will write up more later. It may be entertaining.
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So what was the story with this place? It was a series of dares gone wrong. Well, once upon a time, god decided to test man's intelligence, and man discovered quantum mechanics and developed bombs capable of destroying the human race. Then she wondered if there was any limit to man's stupidity, so she made some terrain so full of rocks and holes and rocks and rocks that no-one would ever be mad enough to map. But someone did. At least no-one would ever think of organising a race there, as the map wasn't sufficiently detailed to provide any information as to where one was. And if anyone were to organise a race there, for sure only the insane would turn up. Yet controls were put out, the event announced and come people did. God, suitably impressed with humanity, said, let it rain.
And it's all about the details: some of the rock was magnetic.