Good game, and funnier than I expected, especially since I've never played any of the previous ones. I can tell there is a lot of fan service here, but it's easy to get into. If you've got a free afternoon, and don't mind the price, feel free. Now I almost want to play the other episodes, but I don't want to spend a lot of money.
This guide was quick to write up and I almost wanted to make a pure FAQ, but a walkthrough was just as easy, if not easier, so I did it as I always do. Some of the puzzles are quite tough, and you may not figure them out if you don't have the hints option turned up to max, Sam & Max.
Check it out at OCModShop.