Game Design: “Shadows on Deck” - The Game Maker's Companion: Game Development - page 180

Figure 7-9. This chart shows how the difficulty increases as new abilities and hazards are added to the game
Conclusion
So there we have it. The bones of the game are now in place. We have a player character and a
rough idea of the story we will tell. We've planned out the levels we'll go through, how the player
will move, and the challenges and monsters they will face. There are still lots of details to sort out
before this could be called a full game design, but now we are starting to get a good idea of what
the game is about.
As ours is a story-driven game, it is now time to devote some serious attention to the story.