hop.inputBinding — the 'Hop' control. Held longer, the hop carries higher. On touch it is the one control a thumb reaches for without looking, so it takes the largest circle the overlay draws (`large`, a 72px radius) and the lowest priority number in the scheme, which puts it in the bottom-right corner of the right-edge band — under the right thumb on a phone held upright, where the tall frame this game films at leaves the most room. `group` keeps it beside Shake, so the two read as one cluster. It is a hold as much as a press: the penguin leaves the ledge on the press edge and keeps rising while the control stays down, so a thumb resting on the button and a held Space produce the same arc.