Applications :: Cocoa Game-Building Application For The Classic Environment?

I am trying to find an application that I used when I was much younger in the classic environment. It was called Cocoa and was a basic game/application builder that was object-orientated and worked around creating rules for each object. I can remember that the sample level involved moving away from a dog to get a key and open a door - not specific I know but it is something...

I've been trying to find it, but it is hard to find considering there are so many other things called Cocoa. Hoping that someone else knows what I'm talking about, where I could find it or if it's been brought to OS X.