Tap the two pedals in rhythm to climb. No gears — just your legs against the hill.
No gears — you pedal by tapping. Your weight and FTP vs the grade decide if you make it.
Pedal by tapping the two buttons alternately — left, right, left, right (or ← →). Faster = more power, up to a point; spin too fast and you bog. Stop and you’ll roll back.