Every 10 seconds, your last 10 seconds replay as a translucent ghost of you. It loops forever, copying exactly what you did.
To open the gate, all three colored buttons must be stepped on at the same time. You can only stand on one at a time, so you need your past selves to cover the others.
After all three are held, reach the golden ⭐ star to win. You get up to 4 loops (you + 3 ghosts). Move: WASD / arrows / tap-and-drag on mobile.