Purrfectly Hidden Cats: Kittenrock

Description
The game consists of a single-line drawn image of Kittenrock, a tourist-like destination popular with hikers and cats. Into this drawing 75 cats have been inserted. Fifty of these cats are hidden in plain sight though they are disguised so they may appear partly hidden, full-on or in profile, or a combination of any of these descriptors. When identified, these cats turn purple, move to a better position and a thought bubble appears.
The remaining 25 cats are hidden; these have to be located by interacting with items in the picture, opening doors and such. When identified, these cats turn red before revealing their thought bubble. In addition to identifying the cats, there are special achievements to be earned. The game saves automatically when a cat has been found, there are no hints in his game.