Metal Gear Solid Touch

The player navigates through several missions based on stages from Metal Gear Solid 4, each introduced by brief text summarizing the story so far. The player moves their finger across the screen to aim, tapping to fire, and moving their fingers together or apart to zoom in or out with a sniper rifle, removing their fingers from the screen to get behind cover and avoid enemy fire. The main character's primary weapons, an assault rifle and a sniper rifle, can be rotated with one another by pinching the device's screen.

Source: Wikipedia, "Metal Gear Solid Touch", available under the CC-BY-SA License.