Conductive Courtesy Test

Crossfire adds a second edge emitter and an extra movable shield. You must park a shield in the left beam, then move two other crates onto contacts to shut down both lasers.

Push conductive cubes onto ◎ contacts to power the exit. An active horizontal laser sweeps row 2, but crates and walls block it. Both contacts switch the laser off; live beam cells are impassable.

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.