Hey, iv been playing Virtual villagers for while and i recently compleated the 16 Puzzles, and i was just wondering, what elce is there to do? after all the puzzles are done, and i have a few other questions

1. can the population go over 90? if so How?
2. what do i do with the cave i just opened?
3. is there any other hidden extra puzzles?

Thanks alot guys!