Red Remover

I first came across this game on Kongregate and later when I got the iphone I discovered that it was available on iOS. Don't let the cute faces confuse you with the level of difficulty that it holds. The game is physics based in the fact that if you tap on a shape to remove it, other shapes will react depending on it's relevance to the placement of the neighboring shapes. The goal of each level is to keep all the green shapes intact while also tapping on the red shapes to remove them. Each level naturally gains difficulty and there are several times I've had to mess around until I figure out how each shape will react in order to keep the green shapes. 

Green shapes are what should be left 

Light red shapes can be removed

Dark red shapes can not be removed

Blue shapes can be removed and don't count against you

There are 80 levels in the game and recently 25 more levels were added. One of the things I like most about the game is that when you've beat a level, there's also a 'par' for each level. The par number depends on the difficulty of the level and presents an additional challenge from simply beating the level in the first place.