This is a boolprop EPIC Legacy Challenge. Rules are here at the forum, or here on the blog. Basically it’s like a simplified, less-restrictive (and less complicated!) version of an Apocalypse Challenge – many things are blocked at the beginning, and through the generations you access different areas.
Chapter List is here.
We are currently on the tenth and final generation, and the heir is Rizzo:
Winner of Best Sims 3 Challenge at the Boolprop Golden Plumbobs 2017!