I'm up at an unreasonably early hour for me as it's that time of day when kitten mayhem reigns - so I've left them in the bedroom with N, who can sleep through anything and where there is less stuff to break.
Their favourite things to play with are a little toy doughnut, the padded mat out of one of their carriers (they go mad for that, dragging it around the room with the other one pouncing on it), and of course each other (I had to "No" some wrestling on the bed last night!).
Fluffy toys seem to make Atty go aggressive and growly (Sonic used to do that) so I'm going to have to get some more sizes and shapes of fabric catnip toys which they seem to love and enjoy without getting overstimulated.
I'm refusing to feed them before 8am because I don't want to make a rod for my own back.