The challenge is to make 25,000 gold and move into Proudspire Manor without doing a quest, slaying a dragon etc.
to make it simple, here is a basic copied list of rules from the page itself, good luck to any who try, and post below if you think you may want to try it, you could even make a blog on here to track your progress if you wanted to.
[*]Start the game with no money, gear, or skills
[*]Earn 25,000 gold to buy Proudspire Manor in Solitude
[*]No quests allowed, unless they're completely mundane
[*]Eat three meals a day, and get at least nine hours of sleep in a bed every night
[*]No fast travel. If Olaf needs to get somewhere, he has to go on foot
[*]Olaf can't cast spells or wear heavy armour. He can only use basic weapons
[*]He will only ever kill another person in self-defence