[dagw]

like it had an iphone app (game) product placement.

Monument Valley. Although according to both parties no money changed hands. The producer simply liked the look of game, called up the developers, asked if they could use it and the developers said "sure".

[passivepinetree]

It's worth noting that Monument Valley is an excellent game, product placement or no. It's often the first thing pointed to in the whole video-games-as-art debate.