How about a Solo Game that lasts 4-7 days where you compete in a challenge every 8 or 12 hours, advantages will randomly pop up for you to click for a short amount of time(1-5 minutes) and your placement would be based on your overall score at the end.
1st - 10,000 points
2nd - 9,000 points
3rd - 8,000 points
4th - 7,000 points
5th - 6,000 points
6th - 5,000 points
7th - 4,000 points
8th - 3,000 points
9th - 2000 points
10th - Under 2000 Points.
It could also potentially work as a Outcasted Simulator where you have to collect water, fish, and eat and you can look in the jungle for advantages.
I could also imagine a fast version of the game that lasts 1-2 hours and you will have that amount of time to compete in every single one of the challenges. Could be a good way to let people practice the comps.
Sin