Why start it from scratch? You can just make some minor edits to the rules of the old one, and pass it as a new challenge!
Create 1 Young Adult Sim. No other Sims can be played.
We can all agree WA does not bring related changes, so this rule shoudn't be modified.
Lifespan set to Long.
Same
No cheats or modifications.
Same
Use of the Moodlet Manager and Mid-Life Crisis is banned.
WA does not bring new overpowered rewards so this rule should stay unchanged too
No Careers (don't start them and Quit just for Happiness points) or business investments. All income must be from Skills, Skill Opportunities, or Special Opportunities.
Since all income should come from skills, it's natural relic hunting should be excluded too; relic hunting means selling stuff you find in tomb.
Adventures also would not be allowed(since they give simoleons), unless they are skill-related Adventures. Tomb exploring however, would, as long as you don't pick up anything (for Photography).
Move your Sim into an existing house or build one yourself. Move as often as you want.
Vacation homes aren't relevant to this, as you cannot move in them. You would be allowed to get vacation homes if you can get enough Visa Points from skill-related adventures.
The Challenge ends when you have maxed all 13 skills and completed all Skill Challenges in each Skill Journal. NOTE: It is widely accepted that the Guitar Star Challenge is bugged and nearly impossible to accomplish without using a cheat. So, it is recommended you just ignore Guitar Star.
New Rule: For every vacation you have, add the number of days you spent there to your score. Round the number up (so if you spent just 2 hours in a vacation, to buy a nectar machine or a camera, it counts as one day).