This is from the help pages to Tiny Wings (iTunes Store link) by Andreas Illiger.

That’s all you need to know, right there:

  • Goal: flight.
  • Conflict: this will be difficult because your wings are tiny.
  • Game mechanic: perhaps you can use the many beautiful hills to help.

And then there’s an illustration to piece all the pieces together and explain what you’re going to do.

The whole game is explained in two sentences; two sentences that manage to contain pathos, hope, a goal, and hints at the gameplay mechanic for achieving that goal.

Visto aqui, via logicola