Ever Seen a Cat?
This is a repetitive, overly-simple hidden-object game.
It's a series of repeating monochromatic line-drawn scenes in which you are supposed to click on abstract cat-like shapes while pleasant music plays.
For the most part it is fair, but some of the abstract cat-like shapes are especially abstract. For example, a cactus with two dots for eyes? Cat. A semicircle with a single triangle protrusion that looks vaguely like a cat ear? Cat.
I think it might be too frustrating for children, but I guess it depends on how patient your children are. :)
Keep clicking away and you should get 100% achievement in 1.5 to 2 hours. So, yes, it's quite short, too.