Lantern Switchyard

A movable lantern trolley carries the first mirror between two rows. Afterglow receivers retain charge, requiring multiple optical routes. The beam is previewed immediately and drawn through actual mirrors.

Adjust four mirrors to route a light ray through the two receivers. Trace tests the actual ray.

Tap or click the controls. Keyboard: Tab and Enter/Space operate every button; arrows/WASD move where available, R restarts, Z undoes calm puzzles.

Mistakes remain revisable. Unlimited undo and restart recover deadlocks.