My final project is a frogger game. The user must guide the frog across the street without being hit by a car in order to win the game. See the pictures below
When the world starts the user sees the frog, who asks for help. The frog also asks the user to press the "Enter" button.
When the user presses the enter key s/he will be taken to the "game view" with the instructions showing. The user can toggle the instructions on/off by pressing the "I" key.
The user uses the arrow keys to move the frog in various directions as stated in the instructions. If the frog gets hit by a car the game ends. If the user can guide the frog across the street then the game ends and the user wins.
There are cheats built into the game so that the person grading the project can win if the cars are too fast. See the world methods and the comments in them. If you cross the street in the middle and are able to do it successfully, move the frog either left or right to activate the sensors to trigger the win (the sensors are small hockey pucks, and the frog must be within a certain radius to trigger the win).