City Bike Stunt puts a stunt course in an urban setting: ramps between rooftops, gaps over streets, loops through scaffolding. You ride to the finish while managing the bike's balance in the air, because landing badly ends the attempt.
The city setting gives the jumps a sense of scale that a flat track doesn't, which makes the successful landings more satisfying.
Lean the bike so its wheels are roughly parallel to the surface you're landing on — nose up for a flat landing, nose down when landing on a downslope.
The focus is on completing the course rather than beating a clock, though faster runs usually score better.
Yes — it runs in the browser with nothing to install.