Mirror Beam· Advanced

Goal

Place mirrors to guide the laser beam from the source to the target.

How to Play

  • Tap an empty cell to cycle mirrors (/ → \ → empty)
  • Mirrors reflect the beam at a 45-degree angle
  • Place all mirrors so the beam reaches the target to clear!

Mirror Direction Matters

A / mirror reflects the beam upward, while a \ mirror reflects it downward. Place the correct angle.

OK
NG

Beam Must Reach Target

Without mirrors or with wrong placement, the beam will miss the target. Plan the path carefully.

OK
?NG

Completed Example

  • Tap an empty cell to cycle mirrors (/ → \ → empty).
  • Mirrors reflect the beam 90°. Walls block the beam.
  • You must place all given mirrors to clear the puzzle. Check the remaining count at the top.

Tip

  • Try tracing backward from the target to figure out mirror positions.
  • Fixed mirrors (gray) are hints. Analyze their direction first.
  • Use undo freely. Experiment with different placements while watching the beam.

Mirror reflection puzzles train mental rotation and sequential planning. Spatial skills are trainable (effect size g=0.47) and planning tasks activate the prefrontal-parietal network.

  • Uttal, D. H. et al. (2013). "The malleability of spatial skills." Psychological Bulletin, 139(2), 352-402.
  • Baker, S. C. et al. (1996). "Neural systems engaged by planning." Neuropsychologia, 34(6), 515-526.