AUTO picks Medium on phones and High on desktop. Low and Medium keep phones at 60 fps; High adds real shadows and post effects; Ultra has no performance cap.
For fullscreen on iPhone: tap Share → Add to Home Screen, then play from the RR icon.
LOOK
Left thumb: move (push to the edge to sprint). Right thumb: look. Run into lime striped walls to climb. SPECIAL 2 sits above SPECIAL 1; tap a running special again to cancel it. Gliding: JUMP becomes BOOST (2 per glide).
A short tip shows the first time each ability is ready, with the right button for your device. Tap a tip (or wait) to dismiss it.