I'm 18 and i bought this game for myself (which with hindsight seems pretty silly!), but I do seem to have the mind of a four year old though!
I recieved a promo disc of the spongebob movie game and enjoyed playing it as it was rather hard and involved a lot of thought and logic, and when I purchased the game I had expected it to be longer. I shall admit that a few times I had to look up on the internet how to get past a certain point, showing that the game involves a lot of thought! However, I managed to finish the game in maybe an hour or two and was slightly dissapointed when it finished.
I suppose the game would be longer when younger children play it, but they may need help from their parents.
I have yet to play the second game (Lights, Camera, Pants!) so I can not really review it, however I think that the price was good as I'd looked at other deals and this was the best.