Many Farmville cheat codes aren't so much "codes" in the traditional sense as they are ways to take advantage of the game and maximize your profit. The only code that matters for these cheats is the code behind the game, and how you can take advantage of it. Farmville is a fun game even without cheat codes, but watching your cash go up faster than your neighbors and acquiring lots of ribbons to show off in your live feed is worth whatever little feeling of guilt that comes from taking advantage of Farmville cheat codes, or as I like to call them, "creative problem-solving methods."
Many of the cheats out there today, such as the Hay Bale trick and the Soybean trick, are well-known and have been around since the game's inception. Some Farmville cheat codes only work for certain browsers, such as the following one for Firefox, or for certain neighbors. The only suggestion is to try each one out, and if it works it works, and if not, you move on. If you're looking for more Farmville cheat codes, you can always go to a website or a blog dedicated to keeping on top of all the information you need to get ahead in Farmville.
If you really want to get your farm in top shape fast, consider downloading a cheat engine. This is an open-source tool that allows you to modify variables in your computer's memory. In plain English, this means that you can change how fast crops ripen and are ready for harvest, how fast your farmer moves, and how much XP you get. I would recommend finding a guide before you start doing this on your own, in order to help you figure out which variables to change. You won't be able to change everything, as a lot of the code is stored on Zynga's servers, but you'll be able to get a significant leg up on your competition.
Learn more about the Farmville Cheat Codes by clicking here.