I got it in the Lucas Arts archives pack with Full Throttle and a few other games.
I didn't play it when I first got it, I didn't know how! lol, I'm only 17 now, so I must have been really young. I did manage to beat it eventually though. I think I was still in elementary at the time. I still remember the hard time I had trying to get that damn rat into the trap, I drove myself crazy over that one!
I noticed the LucasArts site has a "patch" that is a savegame that takes place directly after you catch the rat. The puzzle is now labeled as a glitch now I suppose, lol. I did manage to beat it though, so it isn't impossible.