AI-assisted browser check from NextGenRunGames: I completed puzzles 1–3 using the on-screen buttons. Puzzle 1 demonstrated the opposite movement in one press. In Puzzle 3, Show one step named both outcomes ('B stays; A moves') without advancing the move counter; later the status changed to 'A stays put; B moves' when A hit a wall. That made the blocking rule explicit in this automated sample. I haven't tested later difficulty or human first-time comprehension.