Limbo

People really need to play Limbo.

It is such a shinning example of how mechanics can be introduced to the player, before they are required to be used. This combats the frustration that players would feel with the frequent deaths of the character.

Limbo, is also a good example of how audio can be used to create atmosphere in play. The lack of music and the subtle use of sound effects create a great tension and unsettlement in the game.