Basic Premise: Plant crops and harvest them to earn money and experience points which will allow you to develop your own personal farm complete with livestock, decorations, equipment, and a home of your choosing.
ABC's-Basic Premise: This farm game offers numerous rewards in order to overtly reinforce people into continuing to play the game for enjoyment purposes (it still makes money through advertisements). However, it also uses covert behavior modification to increase the likelihood that you will use your credit card to purchase "Farmville Cash" to purchase even cooler buildings, vehicles, and decorations for your farm. After you realize how long it takes to build a huge farm, why not spend a few bucks to greatly cut down on your time? After all, time is money...and they'd like some of yours.