Heres a good guide for whack-a-kass http://www.neopets.com/~Aerials9 Also there is a screenie of using the tree +rep would be nice
i havn't done over 1000 yet but i got 986 before. I loved thid game because it was so easy to get NP on. Just wait for the wind and wack! 400 np right there in 15 seconds.
you have to hold space bar while its going up and let go while its going down. try to hit the kass when its beak is just at the blumaroo's ears. when its about to land, hit space and let go at the top of the bounce to try to get 5 or more bounces.