Ok, a newbie here. I am seeing lots of tutorials that use either the getOneObjectAtOffset method to remove and object from the world when it is touched by another, and I am also seeing a technique using canSee and eat (which seems more straightforward to me) However I cannot get canSee / eat to work and they are not show in my documentation (do they work in Greenfoot 3.0.4 ?? - why doesn't it work for me - Thanks?