A story doesn’t move forward until a character wants something. So - a game doesn’t move forward until the _player_ wants something. Five seconds after you press start, you’d better know the answer to the question: “What do I want to happen? — Jordan Mechner. “The Making of Prince of Persia”.
A game is an interactive experience that offers designed scenarios meant to engage the audience and present concepts and emotions through the interactions — Kellee Santiago

The 7 commandments all video games should obey

Original post at cracked.

7. Thou shalt let us play your game with real-life friends.
6. Thou shalt not pad the length of your games.
5. Thou shalt not force repetition on the player.
4. Thou shalt make killing fun.
3. Thou shalt admit when enough is enough.
2. Thou shalt make sure your game actually works.
1. Better graphics do not equal innovation and/or creativity.