Every week Apple makes an iOS app free to its customers and this week we have a classic platformer called ‘Chameleon Run'.

The controls are dead simple, there is one button to jump and one button to switch colour. As your runner moves along the level he/she must negotiate the various obstacles and switch colour to match that of the platform they are running on. Obviously, this simple conceit grows trickier as the levels progress demanding a greater dexterity with each passing moment. 

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