How does this work?
Choose a write head: its highlighted cells receive the pulse. A cell changes polarity only if field strength reaches its printed threshold. Weaker cells switch first; stronger cells keep their memory. After each pulse the field returns to zero, but the written pattern remains.
Match all six target dots. No timer. Undo freely. Try to beat your personal pulse record. Keys: left/right select head, 1–3 strength, N/S polarity, Space pulse, Z undo, R reset, H hint. This is a simplified puzzle model of hysteresis, not a scientific simulator.