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Nurikabe ist ein Logikrätsel mit etwas komplizierteren Regeln und herausfordernden Lösungen.

Die Regeln sind nicht so einfach. :)
Man hat ein Gitter aus Quadraten. Manche der Zellen enthalten von Anfang an Nummern. Das Ziel ist, Herauszufinden, ob die Zellen jeweils "schwarz" oder "weiß" ist (bei 'Insel im Strom' auch "Wasser" bzw. " Land" genannt). Die Schwarzen Zellen bilden das "Nurikabe" (bei 'Insel im Strom: den "Strom"): Sie müssen alle orthogonal zusammenhängen (ein einziges Gebilde ergeben), dürfen keine Nummern enthalten und 2x2 oder noch größere schwarze Rechtecke dürfen nicht auftreten ('Insel im Strom nennt diese unzulässigen Blocks "pools"). Die weißen Zellen bilden "Inseln" (wodurch 'Insel im Strom' seinen Namen erhalten hat): jede Nummer n muss Teil eines n Zellen großen Gebildes sein, welches nur aus weißen Zellen besteht. Jede weiße Zelle muss zu genau einer Insel gehören; Inseln müssen genau eine numerierte Zelle enthalten. Zur Lösung markiert man diejenigen Zellen schwarz, die man als zum Strom zugehörig bestimmt hat, und versieht die (unnummerierten) Zellen mit einem Punkt, die man als weiß ermittelt.
Ein Klick mit der linken Maustaste färbt die Quadrate schwarz. Mit Rechts setzt man Punkte. Die Maustaste gedrückt halten und ziehen markiert mehr als eine Zelle.

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03 Mar 2009

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