i have completed all the puzzle. what goes in there? anything?

No, nothing goes where the blue-ish orb-like object is between the Nature and Magic Factions on the Tech page. If you completed Puzzle 15, you should see the pearl as a key in the door in the Collections page. If you finished all 16 puzzles, then it sounds like you're finished except for the two awards you're missing. Then, you can keep your tribe going and check in on them or pause the game and go back to it. Maybe start a 2nd tribe?

oh ok. thanks. im having trouble getting a villager past age 76 tho..thats goin to be a tough award to get.

I've read that one trick to solving that is to make sure that your tribe has plenty of food stocked up and farmers and doctors on hand in case anyone gets sick, then leave the game running for a couple days. When you log back in, there should be some that lived 90+.

[spoilers]The pearl itself is actually used to free the door key; once it's switched for the key, the real pearl has no further use. Hope that clears up a few things.[/spoilers]

ok thank you.

You could try to set goals like, finishing the game in a certain amount of time, or finish the game without anybody dying (it is possible), or even make a game without any faction chosen!

Sorry but you can't complete without choosing a faction at least one of the puzzles needs a certain level of your chosen faction to be able to start/complete it.

My personal goals are to drive three tribes to certain hair colors; I'm developing black, red, and blond-haired tribes.

Like others, I'm going for the rewards now that everything else has been solved. Also, I noticed some of the graphics are different (more foliage, etc). Probably doesn't really change, but it makes it more fun. Is it me or does stuff get more vivid?

Also, I like to change their names a lot. One generation are names of paintings, the second are named after spices, the third named after old boyfriends. LOL