I played through Monument Valley and its Forgotten Shores expansion in about three total playing hours, and even though the experience cost me about $7 on the App Store it was money well-spent. In my research on MC Escher and puzzles, I realized that the game would be a good source of visual/concept ideas, and I finally caved and downloaded it.
Monument Valley is terribly thin on its narrative (I didn’t find it as moving as the reviews made it sound) but it is a beautiful iOs game with no equal that I know of. I love the idea of manipulating the perspective of an environment to create paths where there were none before through the use of optical illusions. I love puzzles, I love illusions and this game delivered both, not to mention how beautifully it’s packaged and presented (right down to a very solid, atmospheric soundtrack).