This "phantom grab game" appears to be a natural for kittens and older cats, for that matter, as every kitten I have had in the past enjoys playing this game. All that is necessary is to hang up an old blanket on a horizontal rope (or some other similar item that is expendable) and let them play at it.

My cats and kittens do not play with manufactured cat toys. Is it because they have access to the outside at any time during the day? I have even bought some catnip the other day, and they do not seem interested in that either.