So this is something I've recently started to think about lately and it's honestly a case of genuine curiosity more than anything else. Many fantasy/adventure-oriented video games usually feature a level defined by flowing rivers of lava, active volcanoes and long stretches of barren, rocky land to trend through. Hell, Star Wars: Revenge of the Sith featured an entire planet themed around this exact same concept.
Since these type of environments don't actually exist in real life (well, on Earth at least) my question is, what conditions would need to be met in order for an environment like this to exist in real life and function like they do in video games? How hot would the lava need to be in order for it to be as viscous as water (which is what video game lava basically is)? Could you hop across large rocks situated on top of lava flows like makeshift platforms? Assuming you had both a gas mask and the right kind of getup, could you even set a single foot in this place without burning to a crisp, blowing up or suffocating? Could any sort of life at all adapt to living in an environment like this (this as in, the space between the lava flows and rivers, not the actual lava itself)?
Also, key note. I'm not interested in HOW this environment came to be, only the way it would function.