Ahhhh~~~~~~, ****, I lost my 2 fingers! !
Cut Fingers is the MOST scary game in App Store that will makes you and your friends scream. Retina screen supported.
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★ To play this game:
1. Put and keep your finger in the circle.
2. When the blade drops, release your finger as soon as possible to evade it.

In 2 Fingers or 3 Fingers, you need to put 2 or 3 fingers to fill all circles, and the blade will drops one by one, which will be really big challenge for you. 
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★ CAUTION: Do NOT play this game on hard floor or high place, you may drop your iPhone/iPod to the ground!
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★ NOTE: You can also ★PLAY WITH YOUR FRIENDS★ in 2 and 3 Fingers Mode. Fill one circle by your self and ask your friends to fill the others using their finger, then bet who will be cut.

Source: http://itunes.apple.com/us/app/cut-fingers/id434122036?mt=8