Knots Gaming App for iPhone
Knots is a cool little game for the iPhone that allows you tie to hands. The game is very addictive and very simple to use. Knots game for iPhone is also free, but is monetized with non-intrusive ads. Knots is a multi-player game, which means you can play it with your buddies too.
This game won’t cure cancer, but it is very addictive for what it is. More interestingly, the monetization method is simply intriguing.