おおきく振りかぶって２号 app for iPhone and iPad

Test if your Dynamic visual acuity (DVA) is good enough for you to be a baseball player!
Simply press from 1 to 25 and see if you can finish it within 15 seconds.

You can compare your results with people from the world using the game center.

About Big Windup! and DVA:
Dynamic visual acuity (DVA) is defined as the ability to discriminate the fine parts of a moving object. DVA is generally better in baseball players than that in nonplayers. Better DVA of baseball players is primarily due to a better ability to track moving objects with their eyes, and is important to baseball players.

In the baseball manga "Big Windup!", baseball players use this game to improve their DVA. For your reference, here is how they did:
Tajima - 7.9s
Hanai - 18.2s
Abe - 20.7s
Mitsuhashi - 28.3s