The origin of this game is a problem of a man named Noah who lived a very long time ago: You have to put animals into an ark, always 2 animals of the same kind on neighboring places. If you play it the 'hard' way, then you can put the 2 animals also on places which have only a corner in common. You may not put such animals which would eat each other on neighboring places. The 'Who eats who' is symbolized by the red arrows. When you play a new game the program always selects an ark type randomly. The game can be solved for every ark type. Good luck !
