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Name: Hold on!
Maker: IMAK Creations
Compatibility: iPhone, iPod Touch, iPad.
This app costs £0.69, just over a dollar. The premise is simple -- hold your finger or thumb down on the button and maintain it for as long as possible. A timer shows your progress and allows you to compete against previous high scores.
If you want to battle against others, a bluetooth option means you can use the app's multiplayer option.
Source: App store