The letters at the borders indicate the letter that is seen first in the corresponding row or column. Of course, invisible letters are not seen at all.
Given letters may be visible as well as invisible.
Solution code: all visible letters in natural order
on 24. February 2011, 23:16 by lupo
@Javier: all visible letters, from left to right, top to bottom. The code of the sample would be: NDENED
on 24. February 2011, 20:10 by Javier Rebottaro
@Lupo: Sorry, but I do not understand the code. :-(
on 30. November 2010, 13:05 by Realshaggy
Sehr schöne Buchstabensalat-Variante, in die man sich trotzdem nochmal richtig neu reindenken muß.
on 29. November 2010, 18:07 by Mody
Eine wirklich pfiffige Rätselidee. Mir hat's großen Spaß gemacht :)
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