[In this weekly feature, GameSetWatch rounds up the week's most popular paid and free iPhone and iPod Touch games, as current on the iTunes App Store.]

This week's top paid iPhone game titles on the App Store, as captured on July 25th 2011, are as follows:

1. Angry Birds ($0.99)
2. Zombie Gunship ($0.99)
3. Stickman BMX ($0.99)
4. Fruit Ninja ($0.99)
5. Angry Birds Seasons ($0.99)
6. Angry Birds Rio ($0.99)
7. Tiny Wings ($0.99)
8. Cut the Rope ($0.99)
9. Words With Friends ($1.99)
10. The Game of Life: Classic Edition ($0.99)

Limbic Software's "aerial zombie defense" title Zombie Gunship and Traction Games' Stickman BMX enter the iPhone's top three this week, challenging Rovio's reigning chart leader Angry Birds.

Fruit Ninja and Tiny Wings also remain strong sellers, as EA's The Game of Life: Classic Edition returns to claim tenth place.

Here are this week's top free iPhone games:

1. Stickman BMX Free
2. Zombiesmash
3. Nuts!
4. Prize Claw
5. Rollercoaster Builder Travel
6. Angry Birds Free
7. Top Gear: Stunt School
8. Puppy World
9. Racing Penguin, Flying Free
10. Hanging With Friends Free

Stickman BMX Free tops the iPhone's free app charts, leading to a significant boost in popularity for the paid edition. Gamedoctors' Zombiesmash trails at second place during a limited-time free download promotion, while Limbic Software's Nuts! takes third.

Other popular downloads include Game Circus's crane game sim Prize Claw, Dimension Technics' Rollercoaster Builder Travel, and a game based on the BBC television series Top Gear.