if you complete it in under 5 minutes you get the full 600nps.
and i haven't had much luck with intelligence lately, but it does come in handy, never read many books to my pets and just noticed the other day that one of them is intelligence 45.
but i think the shrine does intelligence points as well.
Solve puzzle in less than 5 minutes 600 neopoints
Solve puzzle in less than 15 minutes 400 neopoints
Solve puzzle in more than 15 minutes 200 neopoints
If you see my sanity, get it to give me a call.