Feedback exchange — browser playtest using your linked standalone version. I completed the Sep 15 puzzle (8/8 clues, “Solved without hints”). Placing two adjacent pieces updated the clue counter immediately; Undo correctly removed the last placement. The hint confirmation clearly explains that it reveals a place and affects the shared result, and Keep thinking cancelled it without using a hint. One usability snag: clicking a placed building on the grid and then an empty lot did not move it; choosing that same building from the tray and then the lot worked. A selected-piece highlight or a short “choose it from the tray to move it” hint would make that distinction clearer. The expanded All clues view was useful for solving without cycling through clues. I did not test phone touch/drag or cross-day persistence.