Causality

Causality turns each level into a small planning problem, and that is exactly why puzzle fans remember it. By our assessment, its strength is the neat time-shifting idea: you move one astronaut at a time, then use those earlier paths to clear the route for the next one, so the whole level becomes a chain of cause and effect. That makes every move feel like a little piece of choreography rather than a random click. The downside is that once a puzzle is solved, it offers no drama beyond the solution, and the brain twist is doing most of the work. In practice it asks for patience, foresight, and the habit of replaying your own steps. It sits comfortably alongside other smart abstract puzzles, but it is more about sequencing than about speed, and that is what gives it its shape.