Algodoo

if you just want color change then use this in oncollide (e)=>{e.this.color:=[0,1,0,1]}
for making it green or (e)=>{e.this.color=e.other.color} both should be made on the pins and not the hitting object (make sure that the collided and the box you want is connected/the same) and if you want i can teach you much more than this my email is 300istilmig@gmail.com ot comment my learn how to script scene