Here are many sites to download the Farmville cheats engine. If one site is shut down, there are many other download sites. Farmville Coin Hack Free download is a related Mahalo page. Also here are videos and blogs on how to use it, and what it does. There are honest game hints and tips here, too, for those with qualms against cheating.

Scroll down this page for the download sites and the tutorial sites. Meanwhile, here is the only non-engine Farmville cheat that is verified to actually work:

Fence your farmer in and you will plant and harvest much faster. Your farmer won't wander off. Buy four fences. Stand on one square, and fence your farmer in around you with the four fences. Turn the fences so that your farmer cannot get out. You have to do this just right, or your farmer just walks around the fences. Once you have it just right, tell your farmer to plant or harvest or whatever needs to be done in those 9 squares. Once those 9 squares are done, move the whole fenced area over to the next 9 squares.

Farmville is a simulation game inside Facebook. It is free to play. The object of Farmville is to have the nicest farm possible. Players plant simulated crops and tend them, much like in the Seasons expansion for the Electronic Arts PC game The Sims 2. The major difference is that Farmville players are on Facebook, where all their accomplishments with their farm are announced to all their Facebook friends. Players can exchange Farmville game items with their Facebook friends, too. After you understand how to use the Farmville Cheats engine, then read how to use cheat engine 5.5 on Friends for Sale.