Place mirrors into the grid to direct a ray of light from the entering cell to the exit cell, both marked with arrows. The ray has to pass every cell containing a number at least once and may cross itself. It enters and exits the diagram in the directions specified by the arrows. Light that enters the entering or exit cells perpendicular to the arrow passes these cells unaffectedly. Mirrors are placed diagonally into empty cells, there may as well be mirrors in the entering or exit cell. Both sides of a mirror reflect light in a right angle. No unused mirrors are placed. Cells containing mirrors do not touch, not even diagonally. Numbers indicate the lengths of each part of the ray (restricted by mirrors or the start/exit of the ray) which passes through their cell. The length of such a part equals the number of lines of the grid it crosses.
Example
Puzzle
Solution code: From top to bottom the number of mirrors in each row
on 8. February 2015, 12:39 by usp
Regeln (hoffentlich) besser formuliert. Weitere Kommentare willkommen!
on 7. February 2015, 16:57 by Alex
super Raetsel!
on 7. February 2015, 11:11 by rob
Klasse.
Wie wär's, die Länge mit Anzahl der gekreuzten inneren Gitterlinien zu definieren? Dann könnte man auf die etwas verwirrenden Punkte bei Ein- und Ausgang verzichten.
on 6. February 2015, 19:04 by r45
Ich schließe mich ibag gerne an, einfach super.
on 6. February 2015, 10:48 by ibag
Gefällt mir total gut!
on 6. February 2015, 09:08 by Luigi
Wenn man erst einmal das richtige Ende des Fadens gefunden hat...