Odie and Ruby jump down the small stairs and go into the balcony readily, while Pinkie is hesitant to go down the small stairs, and has to be carried. Conversely, Odie is hesitant to go back up the small stairs! I don’t know about Ruby, but Pinkie can jump back up well. The stairs are 3 steps long. 😛
Also, Pinkie and Ruby have motion sickness.