I also use the pellets on their ramp/play framework. I predicted them to just kick it off at once but they really have kept in on the whole time. I've yet to transform the world on the run with flakes in it to pellets (I am lazy hehe). Cedar shavings: https://johnathanoygnt.blogolize.com/doherty-wood-shavings-things-to-know-before-you-buy-75024987