Design a clear and simple interface. The primary task of the interface is to present the player with a choice of the available actions at each moment and to provide instant feedback when the player makes a choice.

Design a clear and simple interface. The primary task of the interface is to present the player with a choice of the available actions at each moment and to provide instant feedback when the player makes a choice.

Today's games are more forgiving in the sense that you can save your game almost anywhere, and get back into the action very quickly, whereas in POP when you died you had to go back to the beginning of the level.