Weekly international iPhone apps: 0.03 seconds, M6, Duke Nukem, Trainyard Express

The top free iPhone applications by country* for the week, by number of downloads, recorded on October 4.

1. USA
0.03 seconds (games)

An application to test your reaction times, the eight stages across three levels test the user's response times through a series of seemingly simple tasks such as touching the screen when a certain number of objects appear.

2. UK
0.03 seconds (games)

See "0.03 seconds"

3. France
M6 (entertainment)

Popular French TV channel M6 comes to the iPhone with this free app. Users can watch television series and films or even replay episodes up to 15 days after they have been screened.

4. Canada
0.03 seconds (games)

See "0.03 seconds"

5. Japan
????? (roughly translates as "find the differences" in English) is a simple yet challenging application where users have to find the difference between two seemingly identical pictures.

6. Australia
Duke Nukem 3D (games)

Classic video game character Duke Nukem comes to the iPhone in this all-action first person "shoot 'em up." In this version the muscular hero must battle with an alien race intent on invading the earth.

7. Germany
Finger Balance FREE (games)

A game of skill and patience for the iPhone, players must use their finger to "balance" a ball and guide it safely through a series of obstacles. This free version contains 15 retro style levels.

8. China
????? (books)
The popular series of martial arts and adventure books from Chinese writer Mr. Gu comes to the iPhone in ??????, which roughly translates in English as "Gu's martial arts collection."

9. Italy
Trainyard Express (games)

This puzzle game involves guiding trains of different colors to their matching station; users have to draw the track for the trains to follow ensuring that each train gets safely to its destination.

10. Korea
TV Time (news)

Check TV schedules and watch programs from Korea's major broadcasters from your iPhone with this free app. Users can add or remove TV channels as they wish and share program schedules with friends via Twitter.

*The countries listed are those markets in which the most iOS devices have been sold worldwide. The list of top ten countries is based on AdMob's April 2010 estimate of the worldwide iOS User Distribution.