Each time you enter — a familiar train-car layout, where the “normal” state is your reference. The game subtly applies possible changes before the frame appears: you immediately see the result and make a decision. Spot an anomaly — you turn back. All clean — you move forward. Any mistake instantly resets progress to the first car — and you begin again, becoming more attentive each time.

• A fixed scene reveals new facets thanks to variable anomalies.

• Clean mechanics without UI: nothing distracts from the core — the “normal” and its violations.

• A strong loop “decision → instant feedback”: a tangible growth of skill from attempt to attempt.

• Short, intense sessions that make you want “one more go.”

• No HUD: no markers, hints, or counters — trust your eyes.

• Simple actions — deep skill: “back” upon anomaly, “forward” upon normality.

• Variety of anomalies.

• Light parallax, atmospheric train sounds, neat visual transitions between cars.

• You enter a car with a fixed object layout.

• Inspect, compare with the “normal,” decide direction.

• Correct decisions advance you forward; a mistake sends you back to start.

• The goal is a string of correct choices in a row.