3-5 is a killer. anything over 90k is a good score. I was trying to get 95k and luckily everything fell right and i got 99k.
It depends. It took me days.. but i find if you go away after about 30+ attempts and go to another level, then come back you get more chance things will fall right. there are many times i've been trying the same thing on a level for hours with no joy. then come back later and it happened first time. But its totally random so who knows?!? All i know is that the chance for a good score only happens now and again. With the stylus for the n900 you can near enough aim for the same area every time, and so you get an idea of where things will fall. All i will say for 3-5 keep plugging away. first bird has to go over the first stone columb and land on the left edge of the centre one and explode it just then before it falls. then everything has to break as much as possible. you will start to see from your score if things have broke ok. take note, if you get a bad first bird dont even bother continueing. the second bird go for the end columb. done. just keep trying. you should easily get 86k +
Edit: just realised thats the stratergy for 2-5. haha
3-5 is just a lucky level. keep trying again and again. Its got a secret. you will see if you study it. but it can take days.