If you’re incredibly desperate to waste time, then Fingerless 3D is a decent enough waste. You hold your finger to the screen so that a guillotine is held over it. Keep it held in place and pull out as the blade drops. Simple as that.
The sad thing is that the touted 3D effect doesn’t seem to work. I tried it with my posh glasses and it was just blurry. Oh well.
[Found a free App for iOS or Android? Think it’s good? Hit up Jim Sterling or Maurice Tan and let ’em know. Please do so — finding good free games is hard!]