This is a Tuesday stostone puzzle.
Just in case you didn’t get enough of this type from the one trivial puzzle that doesn’t even use the fitting-together mechanic, I made a few more to post.
Also, the game Patterna just came out on Steam! It’s a game similar that I designed a whole bunch of puzzles for (I think 13 of the 70), so that’s pretty exciting! (This wasn’t the first game released on Steam that I’ve had some amount of puzzles in, because of Doors, but Doors doesn’t have very good puzzles, and I don’t recommend it. There’s another unrelated game coming out later this month too!)