In 2018 or 2019, I streamed a (live action) series (I only saw one season) which was probably made in 2010 or later, set in a California city in the present or near future.
There was some kind of an augmented reality game with many levels, with some huge reward (owning the game company maybe?) to the person who first completed all the puzzles. I think the creator of the game died or went missing (or crazy). The first two levels involved solving puzzles that had to do with stars or airplanes in the night sky, and with deciphering some graffiti on steps.
There is some kind of community area where gamers hang out or live, and most of the people there are trying to solve the same game. There is some pecking order based on what level each person has solved.
Eventually the main character winds up in a house on a hill, and there is a creepy tree outside the house. People can leave by climbing down the tree (maybe?) or a tunnel under the house that leads to a sewer, or a passage that empties out onto some street. There's a double-staircase entry, but every time you go up a staircase, you (might?) wind up in a different room or hallway.
And you always see that creepy tree, oddly illuminated or casting shadows on the house.
Sorry, that's all I have. Any ideas?