Cross forever. Every row forward is points, and the world scrolls up behind you - fall off the bottom and the run ends. One life, no second chances.

Keyboard

Arrow keys (or WASD) hop; space also strides forward. P pauses, M toggles sound.

Touch

Tap anywhere to hop forward. The D-pad in the corner covers sideways and back; the arrows button swaps its side.

Worth knowing

Everything on the road squishes - cars, buses, and the boner killers moonlighting as traffic - and trains flatten, with a blinking light as your only warning. Water needs a pool float under you, and floats drift. Trees and bushes just block. Blue pills and hearts on the grass pay a bonus, lube bottles riding the pool floats pay more, and the deeper you get, the meaner the traffic and the pushier the scroll.