thanks a ton for the feedback and i agree on all accounts. i've been thinking of how to better indicate when the animals enter the correct pens and to make the dogs' influence more obvious (right now it rings 2 cowbells if they enter the correct pen vs 1). as i'm using Box2D, i'm using ~2 second forces emitting from a given dog's location but believe the force is too subtle right now. i want to give the player more control so will increase the strength, there (i've only been able to hit 1900 of a possible 2500 myself so it needs to be a little easier to win). thanks again. you've confirmed where i need to do more work :)