My idea for a game is this:
Farmville meets cooking mama with a twist.
A touch screen interactive work surface such as a desk a counter etc. that plays an app that is essentially a cooking game where you use the touch screen to farm your crops, prepare the food and then finally cook it. The narrative of the game is: You are a novice farmer/cook that wants to be the best they can possibly be in that field, you start from the very basics which is growing your own crops then as you gain experience (points) and level up you start to unlock more features such as new dishes to make, new food to grow, critic exams which are challenges where you have to cook a perfect meal to get bonus points. Once you get to a certain level you unlock online mode where you have 'Cook offs' with other people that have the game using the internet. The online mode cook offs are 1v1 precision and timing tests, the person who can cook the best meal (cut food neatest, cook on the right heat etc) and in the fastest time wins. Your wins will then be put on a highscore board where you can be in constant competition with friends.
There will be a tutorial at the beginning explaining how to play the game and a 'help' section in the options menu for people that still don't fully understand it.
Tension is a big part of this game especially when playing online. As the goal is to be the best you can be and recieve achievements, there will always be a bit of addictive pressure on the player which can only be resolved by achieving the highest score.
The game ends once all the stages of the offline mode are complete along with the in game achievements. Although you will still be able to go back to previous stages and try to best your own highscores if you wish. The farming aspect will still be needed to grow the crops to replay the stages. As for the online mode, when battling another player, the winner of the game will be revealed as the person with the most points at the end of the battle. When you win a battle your name will come up at the end in in big writing with 'Winner' above it in even bigger writing, the loosers name will be located in the corner of the screen in smaller writing.

I would like the surface to look like this but probably smaller...
The game would be called Chef Harvest and the demographic would be ages 3+ as it is a family game.
I would like the game to be on apple devices but not limited to just them, i have said before i would prefer the game to be on an actual work surface so when you are cooking interactively you are still in the same environment or stance as if you were too cook for real.