Spider Dude Parkour is a web-swinging traversal game: you shoot a line at a building, swing from it, release at the right moment and fly across the gap to the next anchor point. The city is the level, and momentum is everything.
It's the same physics idea as Stickman Hook scaled up into three dimensions with an urban setting — release too early and you go up rather than along, release too late and you swing back the way you came.
Attach to a point ahead of you rather than overhead, and release at the bottom of the arc where your speed is greatest and directed forward.
Depending on the mode, there are checkpoints and objectives to reach, but free traversal around the city is most of the appeal.
Yes — it's a 3D game that runs in the browser with nothing to install; close other tabs on older hardware.